core: better bootlog API and implementation

* Now uses topti instead of fxlib for text (including MMU failure)
* Fit .pretext into 4k for everything before MMU succeeds
* A short version of sprintf() for dynamic messages
* Support a driver function, status(), to allow early driver debug
* Expose more useful platform information in <gint/mpu.h>
* Expose the first of a few CASIOWIN syscalls

Makefile

@@ -21,7 +21,7 @@ all-targets := $(foreach b,$(builds),all-$b)
 all: $(all-targets)
 
 all-build%: build%
-	@ echo -e "$B::$W Making into $<$N"
+	@ echo -e "\n$B::$W Making into $<$N"
 	@ $(MAKE) --no-print-directory -C $<
 
 #
@@ -33,7 +33,7 @@ install-targets := $(foreach b,$(builds),install-$b)
 install: $(install-targets)
 
 install-build%: build%
-	@ echo -e "$B::$W Installing from $<$N"
+	@ echo -e "\n$B::$W Installing from $<$N"
 	@ $(MAKE) --no-print-directory -C $< install
 
 #
@@ -45,7 +45,7 @@ uninstall-targets := $(foreach b,$(builds),uninstall-$b)
 uninstall: $(uninstall-targets)
 
 uninstall-build%: build%
-	@ echo -e "$B::$W Uninstalling from $<$N"
+	@ echo -e "\n$B::$W Uninstalling from $<$N"
 	@ $(MAKE) --no-print-directory -C $< uninstall
 
 #

README.md

@@ -30,7 +30,7 @@ access to the low-level MPU features, among which:
 
 The library also offers powerful higher-level features:
 
-* An enhanced versio of the system's GetKey() and GetKeyWait()
+* An enhanced version of the system's GetKey() and GetKeyWait()
 * A gray engine that works by rapidly swapping monochrome images on fx-9860G II
 * Blazingly fast drawing functions when working with the fxSDK (image rendering
   is 10 times faster than MonochromeLib)

TODO

@@ -1,89 +1,45 @@
-# Since compatibility
-
-Another, more recent list of things to do:
-- Complete memory functions in [core/memory.c]
-- Finish the boot log in <core/bootlog.h>
-- Finish the boot log in [core/bootlog.c]
-- Document the SH7305 PFC in <gint/mpu/pfc.h>
-- Change the description of the version number in <gint/gint.h>
-- Define the version number from full Git info
-- Do this display in <gint/display-fx.h> and <gint/display-cg.h>
-- Remove all mentions of GINT_LAX in the code
-- Write exception handlers
-- Do overclock in [clock/]
-- Test getkey()
-
-* Make keysc/keysc.c/state static and review forgotten global variables
-* Find out what happened to the clock frequency on fxcg50
-* Implement profiling
-* Save and restore interrupt masks
-* More keyboard
-
-Strange, (irreproducible?) SysERRORs on SH3?
-- Happened when dealing with overclock and after a transfer
-- SysERROR when add-in fully returns, nothing during execution
-- Affects all add-ins of the calculator!
-
-* Make sure interrupt for extra timers is masked when you ctx_restore to avoid
-  interrupts
-
-* For modules, use #define TMU ((tmu_t *)0xdeadbeef)) instead of tmu_t *TMU
-* Don't hardcode fx-cg50 stack address in fxcg50.ld for Prizm compatibility
-* Implement the gint_switch()
+On the bootlog.
+* Better review of .pretext to make sure everything fits in 4k
+* Move topti to .pretext to use it in the bootlog, also update() and dclear()
+* Use topti in the error message for the missing mappings (hurray o/)
+* Use a serious formatted printing function
+
+Crucial, missing things.
+! core:      the four basic memory functions
+! core:      build an exception handler and a TLB miss handler
+! core:      gint_switch() (driver contexts on stack; arbitrary code?)
+
+Tests to run.
+* core:      run the alignment/size automated tests
+* bopti:     more sizes, gray
+* topti:     all charsets, colors
+
+Completeness elements on existing code.
+* keyboard:  finish the interface
+* clock:     spread spectrum on fxcg50
+* bopti:     blending modes for monochrome bitmaps (use topti assembler)
+* display:   use more of topti's assembler in drect()
+* core:      use cmp/str for memchr()
+* stdio:     serious formatted printing function
+* timer:     try putting the definitions in <gint/mpu/tmu.h>
+
+Keep in mind.
+* keyboard:  make keysc.c@state static and review globals in the project
+* prizm:     don't hardcode stack address in fxcg50.ld
+* prizm:     detect P1 static RAM (stack) in TLB
+* core:      prove and use qdiv10() instead of __sdivsi3
+* setjmp:    more registers may need to be saved
+* core:      free heap when a task-switch results in leaving the app
+* core:      save and restore interrupt masks
+* timer:     make sure ETMU interrupts are disabled in ctx_restore()
+* core:      document the SH7305 PFC in <gint/mpu/pfc.h>
+
+Future directions.
 * File management
-* Drawing functions, bopti and tales
 * Gray engine
-* Overclock
-* Add a driver init function to the r61524 driver.
-* Finish the bootlog and use the keyboard to control it.
-* Save driver contexts on the stack in gint_pause().
-* Write the core memory functions.
-- Allow arbitrary code in gint_pause() instead of just main menu?
-- Dynamically detect P1 static RAM in TLB for runtime Prizm compatibility.
-* Use a solid API for boot-time printing (or just use fxlib)
-- Use qdiv10() (there should be no __sdivsi3 in gint)
-  (bootlog, timer_delay(), getkey_repeat(), int2bcd())
-* Load an exception handler and a TLB miss handler.
-
-# Before compatibility
-
-Bugs to fix:
--  Alignment of ALL .data / .rodata files is required to ensure converted data
-   is properly aligned -> Ok using ALIGN(4)
--  Ensure heap data is freed when a task-switch results in leaving the app (?)
-
-Things to do before 1.0:
--  bopti:	Test partial transparency
--  perf:	Try 284x124 at (-60, -28) (all disadvantages)
--  project:	Check size of *all* library structures
--  time:	Compute CLOCKS_PER_SEC
-
-Things to do later:
--  bopti:	Implement blending modes for monochrome bitmaps
--  clock:	Only measure if requires as option, otherwise trust {FTune}
--  clock:	Handle overclock (relaunch clocks when overclocking)
--  clock:	Split code into several files, change clock_config_t type
--  core:	Remove redundant code linked to environment saves
--  display:	Try to make this module lighter (lots of code in text section)
--  esper:	Cleaner playback, synthesizing
--  events:	Allow customization of keyboard event system (option to return
-   |		events with modifiers, etc)
--  events:	Generate keyboard events on-the-fly by reading state arrays,
-   |		allowing both a faster interrupt and avoiding supressing other
-   |		events inside getkey() and multigetkey()
--  gray:	Same as display, it's quite heavy
--  serial:	Implement a driver
--  stdio:	More serious formatted printing functions and headers
--  string:	Use cmp/str to implement memchr() (assembler examples)
--  string:	Do some tests for memcmp() and memcpy()
--  usb:		Implement a driver
-
-Things to investigate:
--  Registers that may need to be saved within setjmp()
-
-Possibly useful modules:
--  DMAC
--  SCIF, SCIFA
--  TPU
--  USB
--  CMT on SH7305, WDT on SH7705
+* Integrate overclock management
+* A library for profiling with manual calls
+* Audio playback using Martin Poupe's method
+* Serial communication [SCIF] [SCIFA]
+* USB communication [USB]
+* Driver for the watchdog timer [WDT] [SH7705]

include/core/bootlog.h

@@ -5,10 +5,18 @@
 #ifndef GINT_CORE_BOOTLOG
 #define GINT_CORE_BOOTLOG
 
+#include <gint/defs/attributes.h>
+
 /* bootlog_loaded() - section loading stage
    Called when RAM sections have been wiped and copied */
 void bootlog_loaded(void);
 
+/* bootlog_unmapped() - ROM mapping stage failed
+   Called if not enough ROM pages have been mapped.
+   @rom  Amount of mapped ROM, in bytes
+   @size Minimum mapping required */
+void bootlog_unmapped(int rom, int size);
+
 /* bootlog_mapped() - ROM mapping stage
    Called after all ROM pages have been traversed. All of them may not have
    been mapped.
@@ -21,11 +29,19 @@ void bootlog_mapped(uint32_t rom, uint32_t ram);
    handlers set up. */
 void bootlog_kernel(void);
 
+/* bootlog_driver() - driver load
+   Called for very loaded driver. */
+void bootlog_driver(const char *driver_name, const char *status);
+void bootlog_driver_summary(void);
+
 /* All these functions are enabled only if GINT_BOOT_LOG is defined */
 #ifndef GINT_BOOT_LOG
   #define bootlog_loaded(...)
+  #define bootlog_unmapped(...)
   #define bootlog_mapped(...)
   #define bootlog_kernel(...)
+  #define bootlog_driver(...)
+  #define bootlog_driver_summary(...)
 #endif
 
 #endif /* GINT_CORE_BOOTLOG */

include/core/memory.h

@@ -1,22 +0,0 @@
-//---
-//	core:memory - Core memory functions
-//
-//	These are the basic standard memory functions required by GCC.
-//---
-
-#ifndef GINT_CORE_MEMORY
-#define GINT_CORE_MEMORY
-
-/* memcpy() - copy a chunk of memory to a non-overlapping destination */
-void *memcpy(void * restrict dest, const void * restrict src, size_t n);
-
-/* memmove() - copy a chunk of memory to any destination */
-void *memmove(void *dest, const void *src, size_t n);
-
-/* memcmp() - compare two chunks of memory of the same size */
-int memcmp(const void *src1, const void *src2, size_t n);
-
-/* memset() - fill a chunk of memory with a single byte */
-void *memset(void *dest, int byte, size_t n);
-
-#endif /* GINT_CORE_MEMORY */

include/core/std.h

@@ -0,0 +1,29 @@
+//---
+//	gint:core:std - a few standard functions implemented in gint
+//
+//	There are few enough of them that it felt unnecessary to use a full-
+//	fledged standard library.
+//---
+
+#ifndef GINT_CORE_STD
+#define GINT_CORE_STD
+
+#include <gint/defs/types.h>
+#include <stdarg.h>
+
+/* memcpy() - copy a chunk of memory to a non-overlapping destination */
+void *memcpy(void * restrict dest, const void * restrict src, size_t n);
+
+/* memset() - fill a chunk of memory with a single byte */
+void *memset(void *dest, int byte, size_t n);
+
+/* strlen() - length of a NUL-terminated string */
+size_t strlen(const char *str);
+
+/* vsprintf() - an almost-empty subset of the real one */
+void vsprintf(char *str, const char *format, va_list args);
+
+/* sprintf() - an almost-empty subset of the real one */
+void sprintf(char *str, const char *format, ...);
+
+#endif /* GINT_CORE_STD */

include/core/syscalls.h

@@ -0,0 +1,11 @@
+//---
+//	gint:core:syscalls - calls to CASIOWIN
+//---
+
+#ifndef GINT_CORE_SYSCALLS
+#define GINT_CORE_SYSCALLS
+
+/* __os_version(): Get OS version on the form MM.mm.iiii (10 bytes) */
+void __os_version(char *version);
+
+#endif /* GINT_CORE_SYSCALLS */

include/gint/defs/attributes.h

@@ -27,4 +27,7 @@
    access sizes silently fail - honestly you don't want this to happen */
 #define GPACKED(x)	__attribute__((packed, aligned(x)))
 
+/* Weak symbols */
+#define GWEAK		__attribute__((weak))
+
 #endif /* GINT_DEFS_ATTRIBUTES */

include/gint/display.h

@@ -27,7 +27,9 @@ extern uint32_t *vram;
 
 #ifdef FX9860G
 #include <gint/display-fx.h>
-#else
+#endif
+
+#ifdef FXCG50
 #include <gint/display-cg.h>
 #endif
 

include/gint/drivers.h

@@ -9,16 +9,29 @@
 #include <gint/defs/types.h>
 
 //---
-//	Driver initialization
+//	Driver procedure flow
 //
-//	Drivers are initialized in linking order. For each driver, the
-//	following functions are called:
-//	- driver_sh3() [if running on an SH3-based machine]
-//	- ctx_save()
-//	- init()
+//	Drivers are initialized in priority order, and in linking order within
+//	the same priority (which is pretty much undefined). Make sure every
+//	driver's priority level is higher than those of its dependencies.
 //
-//	When the driver is unloaded, the following functions are called:
-//	- ctx_restore()
+//	At initialization, the following functions are called:
+//	1. driver_sh3()            [if not NULL, SH3 fx9860G only]
+//	2. ctx_save(sys_ctx)       [if not NULL]
+//	3. init()                  [if not NULL]
+//
+//	Then, if the on-screen boot log is enabled, the status() function is
+//	called and the returned function is displayed (21 characters max).
+//	4. status()                [if not NULL, if GINT_BOOT_LOG is defined]
+//
+//	If the gint_switch() function is called to temporarily give back
+//	control to the operating system, the state of each driver is saved to
+//	the stack, then restored from there.
+//	5. ctx_save(stack)         [if not NULL]
+//	6. ctx_restore(stack)      [if not NULL]
+//
+//	When finally the driver is unloaded, the system context is restored.
+//	7. ctx_restore(sys_ctx)    [if not NULL]
 //---
 
 /* gint_driver_t - driver meta-information used by gint */
@@ -65,6 +78,14 @@ typedef struct
 	   @ctx  A context buffer filled by ctx_save() */
 	void (*ctx_restore)(void *ctx);
 
+	/* status() - status string generation
+	   When the boot log is defined, this function is called to print
+	   information returned by the driver, for debugging purposes. This is
+	   expected to be a short (max 21 bytes) string because only a few
+	   lines are available for all drivers.
+	   Returns a pointer to a string; a static buffer is suitable. */
+	const char * (*status)(void);
+
 } GPACKED(4) gint_driver_t;
 
 /* GINT_DECLARE_DRIVER() - make a driver visible to gint
@@ -81,11 +102,26 @@ typedef struct
 	GSECTION(".gint.drivers." #level) extern gint_driver_t name;
 
 /* GINT_DRIVER_SH3() - declare a function for SH3-rectification
-   This macros allows the argument function to not exist on fxcg50. */
+   This macro makes its argument NULL on fxcg50, this way the named function
+   can be defined under #ifdef FX9860G while keeping the structure clean. */
+
 #ifdef FX9860G
-  #define GINT_DRIVER_SH3(name) name
+#define GINT_DRIVER_SH3(name) name
+#endif
+
+#ifdef FXCG50
+#define GINT_DRIVER_SH3(name) NULL
+#endif
+
+/* GINT_DRIVER_STATUS() - declare a function for status string generation
+   This macro makes its argument NULL when GINT_BOOT_LOG is defuned, this way
+   the named function can be defined under #ifdef GINT_BOOT_LOG while keeping
+   the structure clean. */
+
+#ifdef GINT_BOOT_LOG
+#define GINT_DRIVER_STATUS(name) name
 #else
-  #define GINT_DRIVER_SH3(name) NULL
+#define GINT_DRIVER_STATUS(name) NULL
 #endif
 
 #endif /* GINT_DRIVERS */

include/gint/gint.h

@@ -8,20 +8,11 @@
 #include <gint/defs/types.h>
 
 /* GINT_VERSION - the library version number
-   Provides gint's running version number, which is made of four fields:
 
-      31           24 23   20 19   16 15                            0
-     +---------------+---------------+---------------+---------------+
-     |    channel    | major | minor |             build             |
-     +---------------+---------------+---------------+---------------+
+   gint is versioned from it's repository commits on the master branch. The
+   GINT_VERSION integer contains the short commit hash.
 
-   The first field is a letter indicating the type of version ('a'lpha, 'b'eta,
-   'r'elease, 'd'ev, etc). The second and third field are the version number on
-   the form "major.minor". The last field is the build number for this version.
-   The build number uniquely identifies a binary version of the library.
-
-   For instance, 0x72100053 translates as "release 1.0 build 83". */
-/* TODO: Fix version number */
+   For instance, 0x03f7c0a0 means commit 3f7c0a0. */
 extern char GINT_VERSION;
 #define GINT_VERSION ((uint32_t)&GINT_VERSION)
 

include/gint/mpu.h

@@ -12,6 +12,8 @@
 #ifndef GINT_CORE_MPU
 #define GINT_CORE_MPU
 
+#include <gint/defs/types.h>
+
 /* mpu_t - supported MPUs */
 typedef enum
 {
@@ -22,27 +24,64 @@ typedef enum
 	mpu_sh7724	= 4,	/* For reference */
 } mpu_t;
 
+
+
+/* On fx9860g, the 256k byte RAM might be extended to 512k if the machine is
+   recent enough. This includes all SH4 and many SH3 fx-9750 GII; the only
+   model known to not have it is the old fx-9860G. */
 #ifdef FX9860G
 
-	/* mpu_id() - get the name of the underlying MPU */
-	extern const mpu_t gint_mpu_id;
-	#define gint_mpu() (gint_mpu_id)
+typedef struct
+{
+	/* MPU type, one of the above values */
+	mpu_t mpu;
+	/* Extended RAM area (8804'0000:256k) is available */
+	int extended_ram;
 
-	/* Quick SH-3/SH-4 tests. Unknown models are assumed to be SH-4A */
-	#define isSH3() (gint_mpu() & 1)
-	#define isSH4() (!isSH3())
+} platform_t;
 
-	/* mpu_init() - probe the MPU type
-	   This function must be executed before mpu_id() can be used. */
-	void mpu_init(void);
+/* mpu_id() - get the name of the underlying MPU */
+#define gint_mpu() (gint_platform.mpu)
 
-#else /* FXCG50 */
+/* Quick SH-3/SH-4 tests. Unknown models are assumed to be SH-4A */
+#define isSH3() (gint_mpu() & 1)
+#define isSH4() (!isSH3())
 
-	/* All fxcg50 machines have an SH7305, which makes things simpler. */
-	#define gint_mpu() mpu_sh7305
-	#define isSH3() 0
-	#define isSH4() 1
+#endif /* FX9860G */
+
+
+
+/* On fxcg50, the processor is always SH4. We can still differentiate between
+   modern fx-CG 50 and older fx-CG 10/20 which are called here "Prizm". (This
+   is done by observing the initial stack pointer.) */
+#ifdef FXCG50
+
+typedef struct
+{
+	/* MPU type (always sh7305) */
+	mpu_t mpu;
+	/* Whether this is an fx-CG 10/20 Prizm instead of an fx-CG 50 */
+	int prizm;
+
+} platform_t;
+
+/* All fxcg50 machines have an SH7305, which makes things simpler. */
+#define gint_mpu() mpu_sh7305
+#define isSH3() 0
+#define isSH4() 1
 
 #endif /* FX9860G */
 
+
+
+/* Platform details collected by mpu_init() */
+extern const platform_t gint_platform;
+
+/* mpu_init() - detect hardware information
+   This function must be executed before other functions of this header can be
+   used successfully.
+
+   @stack  Starting stack address (roughly is enough) */
+void mpu_init(uint32_t stack);
+
 #endif /* GINT_CORE_MPU */

include/gint/mpu/cpg.h

@@ -65,6 +65,7 @@ typedef volatile struct
 		uint32_t CKOFF	:1;	/* CKO Output Stop */
 		uint32_t	:1;
 	);
+	/* TODO: CPG: Add the SSCGCR register */
 	pad(0x28);
 
 	lword_union(FLLFRQ,

src/clock/freq.c

@@ -4,6 +4,7 @@
 
 #include <gint/drivers.h>
 #include <gint/clock.h>
+#include <core/std.h>
 
 #include <gint/mpu.h>
 #include <gint/mpu/cpg.h>
@@ -53,8 +54,7 @@ static void sh7705_probe(void)
 	freq.Iphi_div = idiv + 1;
 	freq.Pphi_div = pdiv + 1;
 
-	/* Deduce the frequency of the main clocks. The following piece of code
-	   hardcodes ckio / 3 and avoids using the division operator */
+	/* Deduce the frequency of the main clocks. This value is ckio/3 */
 	int ckio_3 = 9830400;
 
 	/* Exchange the setting values 2 and 3 */
@@ -68,11 +68,6 @@ static void sh7705_probe(void)
 }
 
 #undef CPG
-#else
-
-/* This prototype will silence warnings on fxcg50 */
-void sh7705_probe(void);
-
 #endif /* FX9860G */
 
 //---
@@ -122,15 +117,36 @@ static void sh7305_probe(void)
 //	Other driver stuff
 //---
 
+#ifdef GINT_BOOT_LOG
+
+static const char *cpg_status(void)
+{
+	static char status[18];
+	sprintf(status, "I%3d B%3d P%3d C%c",
+		freq.Iphi_f / 1000000,
+		freq.Bphi_f / 1000000,
+		freq.Pphi_f / 1000000,
+		isSH3() ? 'e' : 'E'
+	);
+	return status;
+}
+
+#endif /* GINT_BOOT_LOG */
+
 static void init(void)
 {
-	isSH3() ? sh7705_probe()
-		: sh7305_probe();
+	/* This avoids warnings about sh7705() not being defined on fxcg50 */
+	#ifdef FX9860G
+	isSH3() ? sh7705_probe() :
+	#endif
+
+	sh7305_probe();
 }
 
 gint_driver_t drv_cpg = {
 	.name		= "CPG",
 	.init		= init,
+	.status		= GINT_DRIVER_STATUS(cpg_status),
 	.ctx_size	= 0,
 	.sys_ctx	= NULL,
 	.ctx_save	= NULL,

src/core/bootlog.c

@@ -2,16 +2,22 @@
 //	gint:core:bootlog - Boot-time on-screen log for extreme debugging
 //---
 
-/* TODO: Review, enhance and fix bootlog */
-
 #include <gint/defs/types.h>
+#include <core/std.h>
+#include <core/mmu.h>
+
 #include <gint/mpu.h>
 #include <gint/mpu/intc.h>
-#include <core/mmu.h>
+
 #include <gint/gint.h>
 #include <gint/display.h>
+#include <core/syscalls.h>
+#include <gint/clock.h>
 
 #ifdef FXCG50
+void Bdisp_AllClr_VRAM(void);
+void Bdisp_PutDisp_DD(void);
+
 #define dclear(c) Bdisp_AllClr_VRAM()
 #define dupdate() Bdisp_PutDisp_DD()
 #endif
@@ -22,28 +28,34 @@ extern char
 	sgdata, sgbss, sdata, sbss,
 	btors, mtors, etors;
 
-/* bootlog_loaded() - section loading stage */
-void bootlog_loaded(void)
+/* print() - formatted printing shorthand */
+static void print(int x, int y, const char *format, ...)
 {
-	/* Version string - the string constant resides in ROM */
-	const char *base = "gint @";
-	const char *hexa = "0123456789abcdef";
-	char str[14];
+	char str[45];
+	va_list args;
+	va_start(args, format);
 
-	for(int i = 0; i < 6; i++) str[i] = base[i];
-	str[13] = 0;
+	vsprintf(str + 2, format, args);
 
-	/* Retrieve the commit number */
-	for(int i = 0; i < 7; i++)
-	{
-		int shift = 24 - (i << 2);
-		str[i + 6] = hexa[(GINT_VERSION >> shift) & 0xf];
-	}
+	#ifdef FX9860G
+	dtext(6 * (x - 1) + 1, 7 * (y - 1), str + 2, color_black, color_white);
+	#endif
+
+	#ifdef FXCG50
+	PrintXY(x, y, str, 0, 0);
+	#endif
 
+	va_end(args);
+}
+
+/* bootlog_loaded() - section loading stage */
+GSECTION(".pretext")
+void bootlog_loaded(void)
+{
 	/* Size of memory sections */
-	uint32_t rom_size	= (uint32_t)&srom;
-	uint32_t ram_size	= (uint32_t)&sdata + (uint32_t)&sbss;
-	uint32_t gint_size	= (uint32_t)&sgdata + (uint32_t)&sgbss;
+	uint32_t rom_size  = (uint32_t)&srom;
+	uint32_t ram_size  = (uint32_t)&sdata + (uint32_t)&sbss;
+	uint32_t gint_size = (uint32_t)&sgdata + (uint32_t)&sgbss;
 
 	/* MPU type */
 	mpu_t mpu = gint_mpu();
@@ -51,68 +63,121 @@ void bootlog_loaded(void)
 
 	/* TODO: Use a solid API for boot-time printing */
 	dclear(color_white);
-	print(1, 1, str);
-	print(15, 1, " Loaded");
+	print(1, 1, "gint @%7x   SLmkd", GINT_VERSION);
 
-	if((uint)mpu < 4) print(16, 2, names + 8 * (mpu - 1));
-	else print_dec(16, 2, mpu, 6);
+	if((uint)mpu < 4) print(1, 2, names + 8 * (mpu - 1));
+	else print(1, 2, "%6d", mpu);
 
-	print(1, 2, "ROM  RAM  GINT");
-	print(4, 3, "k           c  d");
-	print_dec(1, 3, (rom_size + 0x3ff) >> 10, 3);
-	print_dec(6, 3, ram_size, 4);
-	print_dec(11, 3, gint_size, 4);
-	print_dec(17, 3, &mtors - &btors, 2);
-	print_dec(20, 3, &etors - &mtors, 2);
+	#ifdef FX9860G
+	print(8, 2, "%c?-", gint_platform.extended_ram ? 'R' : 'r');
+	#endif
+
+	#ifdef FXCG50
+	print(8, 2, "--%c", gint_platform.prizm ? 'P' : 'p');
+	#endif
+
+	char os[11];
+	__os_version(os);
+	print(12, 2, "OS%2s%2s%4s", os, os+3, os+6);
+
+	print(1, 3, "ROM%4dk RAM%3d+%1dk ??",
+		(rom_size  + 0x3ff) >> 10,
+		(ram_size  + 0x3ff) >> 10,
+		(gint_size + 0x3ff) >> 10);
 
 	dupdate();
 }
 
 /* bootlog_mapped() - ROM mapping stage */
+GSECTION(".pretext")
 void bootlog_mapped(int rom, int ram)
 {
-	rom = (rom + 0x3ff) >> 10;
-	ram = (ram + 0x3ff) >> 10;
+	/* Check whether all ROM is mapped */
+	uint32_t rom_size  = (uint32_t)&srom;
 
-	print(15, 1, " Mapped");
-	print(1, 4, "MMU ROM:   k RAM:   k");
-	(rom < 0) ? print(9,  4, "???") : print_dec(9,  4, rom, 3);
-	(ram < 0) ? print(18, 4, "???") : print_dec(18, 4, ram, 3);
+	print(20, 3, "%c%c", (rom >= (int)rom_size) ? 'F' : 'f',
+		isSH3() ? 'u' : 'U');
+	print(9, 2, (ram > 8192) ? "E" : "e");
+	print(19, 1, "M");
+	dupdate();
+}
 
+/* bootlog_unmapped() - ROM mapping stage failure */
+void bootlog_unmapped(int rom, int size)
+{
+	print(1, 6, "MMU: add-in too large");
+	print(1, 7, "%8x < %8x", rom, size);
 	dupdate();
 }
 
 /* bootlog_kernel() - gint loading stage */
 void bootlog_kernel(void)
 {
-	print(15, 1, " Kernel");
+	print(20, 1, "K");
+}
+
+/* bootlog_driver() - driver load
+   Called for very loaded driver. */
+void bootlog_driver(const char *drv, const char *status)
+{
+	/* Positioning for the driver name */
+
+	static int x = 1, y = 4;
+	if(y > 5)
+	{
+		print(21, 4, "+");
+		return;
+	}
+
+	print(x, y, "%3s", drv);
+	x += 4;
+
+	if(x + y >= 22) y++;
+
+	/* Positioning for the driver message */
+
+	if(!status) return;
+
+	int len = strlen(status);
+
+	static int mx = 1, my = 6;
+	if(mx + len > 22) mx = 1, my++;
+	if(my > 9) return;
+
+	print(mx, my, "%s", status);
+	mx += len + 1;
+
+	dupdate();
+}
+
+/* bootlog_driver_summary() - all drivers loaded */
+void bootlog_driver_summary(void)
+{
+	int interrupts = 0;
+	uint16_t ipr;
+	print(21, 1, "D");
 
-	if(isSH3())
+	/* Count number of enabled interrupts */
+	if(isSH3()) for(int i = 0; i < 8; i++)
 	{
-		print(1, 5, "ABCD");
-		print_hex( 6, 5, SH7705_INTC._.IPRA->word, 4);
-		print_hex(10, 5, SH7705_INTC._.IPRB->word, 4);
-		print_hex(14, 5, SH7705_INTC._.IPRC->word, 4);
-		print_hex(18, 5, SH7705_INTC._.IPRD->word, 4);
-		print(1, 6, "EFGH");
-		print_hex( 6, 6, SH7705_INTC._.IPRE->word, 4);
-		print_hex(10, 6, SH7705_INTC._.IPRF->word, 4);
-		print_hex(14, 6, SH7705_INTC._.IPRG->word, 4);
-		print_hex(18, 6, SH7705_INTC._.IPRH->word, 4);
+		ipr = *SH7705_INTC.IPRS[i];
+		while(ipr > 0)
+		{
+			interrupts += (ipr & 0xf) != 0;
+			ipr >>= 4;
+		}
 	}
-	else
+	else for(int i = 0; i < 12; i++)
 	{
-		print(1, 5, "ACFG");
-		print_hex( 6, 5, SH7305_INTC._->IPRA.word, 4);
-		print_hex(10, 5, SH7305_INTC._->IPRC.word, 4);
-		print_hex(14, 5, SH7305_INTC._->IPRF.word, 4);
-		print_hex(18, 5, SH7305_INTC._->IPRG.word, 4);
-		print(1, 6, "HJKL");
-		print_hex( 6, 6, SH7305_INTC._->IPRH.word, 4);
-		print_hex(10, 6, SH7305_INTC._->IPRJ.word, 4);
-		print_hex(14, 6, SH7305_INTC._->IPRK.word, 4);
-		print_hex(18, 6, SH7305_INTC._->IPRL.word, 4);
+		ipr = SH7305_INTC.IPRS[2 * i];
+		while(ipr > 0)
+		{
+			interrupts += (ipr & 0xf) != 0;
+			ipr >>= 4;
+		}
 	}
 
+	print(19, 5, "#%2d", interrupts);
+
 	dupdate();
 }

src/core/gint.c

@@ -3,7 +3,7 @@
 //---
 
 #include <gint/gint.h>
-#include <core/memory.h>
+#include <core/std.h>
 #include <gint/mpu.h>
 #include <gint/mpu/intc.h>
 

src/core/mpu.c

@@ -7,11 +7,11 @@
 #include <gint/defs/types.h>
 #include <gint/defs/util.h>
 
-/* This file is only useful on fx9860g machines because all fxcg50 are SH4 */
-#ifdef FX9860G
+/* Holds information about the current MPU */
+GBSS const platform_t gint_platform;
 
-/* Holds the name of the current MPU; initialized at startup by mpu_init() */
-GBSS const mpu_t gint_mpu_id;
+/* This function is only used on fx9860g because all fxcg50 are SH4 */
+#ifdef FX9860G
 
 /* mpu_detect() - detect the underlying MPU
    Many thanks to Simon Lothar for relevant documentation.
@@ -21,6 +21,7 @@ GBSS const mpu_t gint_mpu_id;
    by testing writable bits in the Port L Control Register (PLCR).
 
    Returns the detected MPU type, falling back on mpu_unknown */
+GSECTION(".pretext")
 static mpu_t mpu_detect(void)
 {
 	/* Processor Version Register */
@@ -53,9 +54,37 @@ static mpu_t mpu_detect(void)
 }
 
 /* mpu_init() - detect and save information about the underlying MPU */
-void mpu_init(void)
+GSECTION(".pretext")
+void mpu_init(GUNUSED uint32_t stack)
 {
-	const_cast(gint_mpu_id, mpu_t) = mpu_detect();
+	const_cast(gint_platform.mpu, mpu_t) = mpu_detect();
+
+	/* Detect additional RAM */
+
+	volatile uint8_t *after_ram = (void *)0x88040000;
+	volatile uint8_t *start_ram = (void *)0x88000000;
+
+	uint8_t backup = *after_ram;
+	*after_ram = ~backup;
+	int ext = (*start_ram == backup);
+	*after_ram = backup;
+
+	const_cint(gint_platform.extended_ram) = ext;
+}
+
+#endif /* FX9860G */
+
+#ifdef FXCG50
+
+/* mpu_init() - detect and save information about the underlying MPU */
+GSECTION(".pretext")
+void mpu_init(uint32_t stack)
+{
+	const_cast(gint_platform.mpu, mpu_t) = mpu_sh7305;
+
+	/* Detect Prizm models */
+	int prizm = (stack < 0x8c160000);
+	const_cint(gint_platform.prizm) = prizm;
 }
 
-#endif
+#endif /* FXCG50 */

src/core/setup.c

@@ -4,7 +4,7 @@
 
 #include <gint/gint.h>
 #include <gint/drivers.h>
-#include <core/memory.h>
+#include <core/std.h>
 #include <core/setup.h>
 #include <gint/mpu.h>
 #include <gint/mpu/intc.h>

src/core/start.c

@@ -1,5 +1,5 @@
 //---
-//	gint:core:start - Kernel initialization and C runtime
+//	gint:core:start - Kernel initialisation and C runtime
 //--
 
 #include <gint/defs/attributes.h>
@@ -108,15 +108,15 @@ int start(int isappli, int optnum)
 	   redirecting interrupts and reimplementing drivers, so we can't rely
 	   too much on the system. Ladies and gentlemen, let's have fun! ;D */
 
-	/* For now, we rely on the system to map ROM pages. RAM is always
+	/* For now, we use the system's memory mapper for ROM. RAM is always
 	   fully mapped, but we need to initialize it. We also need to do some
-	   hardware detection because old fx9860g models have an different
+	   hardware detection because old fx9860g models have a different
 	   processor with some incompatible features */
 
 	/* Detect architecture - this will tell SH3 from SH4 on fx9860g */
-	#ifdef FX9860G
-	mpu_init();
-	#endif
+	uint32_t stack;
+	__asm__("mov r15, %0" : "=r"(stack));
+	mpu_init(stack);
 
 	/* Load data sections and wipe the bss section. This has to be done
 	   first for static and global variables to be initialized */
@@ -134,32 +134,20 @@ int start(int isappli, int optnum)
 		: utlb_mapped_memory(&rom, &ram);
 	bootlog_mapped(rom, ram);
 
-	//---
-
-	/* Cancel add-in execution if not all pages are mapped
-	   TODO: Resort to better graphical display, although still fxlib since
-	   add-in is not mapped yet */
+	/* Cancel add-in execution if not all pages are mapped */
 	if(rom < (uint32_t)&srom)
 	{
-		Bdisp_AllClr_VRAM();
-		PrintXY(0, 0, "Missing memory!", 0);
-		print_hex(1, 2, rom, 8);
-		PrintXY(0, 16, "<", 0);
-		print_hex(1, 4, (uint32_t)&srom, 8);
-		Bdisp_PutDisp_DD();
+		bootlog_unmapped(rom, (uint32_t)&srom);
 		while(1);
-//		delay(20);
 		return 1;
 	}
 
-	//---
-
 	/* Install gint and switch VBR */
 	gint_install();
 	bootlog_kernel();
 
 	/* We are now running on our own in kernel mode. Since we have taken
-	   control of interrupts, pretty much any interaction with the sytem
+	   control of interrupts, pretty much any interaction with the system
 	   will break it. We'll limit our use of syscalls and do device driving
 	   ourselves. (Hopefully we can add cool features in the process.) */
 
@@ -173,7 +161,13 @@ int start(int isappli, int optnum)
 
 		if(drv->ctx_save) drv->ctx_save(drv->sys_ctx);
 		if(drv->init) drv->init();
+
+		#ifdef GINT_BOOT_LOG
+		const char *status = drv->status ? drv->status() : NULL;
+		bootlog_driver(drv->name, status);
+		#endif
 	}
+	bootlog_driver_summary();
 
 	/* With gint fully initialized, we are ready to start the hosted user
 	   application. We have already loaded the RAM sections earlier; all

src/core/syscalls.S

@@ -0,0 +1,50 @@
+/*
+**	gint:core:syscalls - calls to CASIOWIN
+**
+**	This files can be seen as a list of everywhere gint relies on the
+**	underlying OS. Although I wish to make gint free-standing, there are
+**	still a few hard dependencies, namely:
+**	* MMU management, because doing it wrong might break the calculator.
+**	* Dynamic allocation, because we can't trash the system heap.
+**	* File system, because it's a mess and we might ruin the ROM.
+*/
+
+/* Dynamic allocation */
+.global ___malloc
+.global ___calloc
+.global ___free
+.global ___realloc
+/* OS version, for debugging purposes */
+.global ___os_version
+
+.section ".pretext"
+
+#ifdef FX9860G
+
+/* OS version */
+
+___os_version:
+	mov.l	syscall_table, r2
+	mov.l	1f, r0
+	jmp	@r2
+	nop
+1:	.long	0x02ee
+
+syscall_table:
+	.long	0x80010070
+
+#endif /* FX9860G */
+
+#ifdef FXCG50
+
+___os_version:
+	mov.l	syscall_table, r2
+	mov.l	1f, r0
+	jmp	@r2
+	nop
+1:	.long	0x1406
+
+syscall_table:
+	.long	0x80020070
+
+#endif /* FXCG50 */

src/keysc/keysc.c

@@ -159,7 +159,7 @@ key_event_t waitevent(volatile int *timeout)
 }
 
 //---
-//	Driver initialization
+//	Driver initialization and status
 //---
 
 static int callback(GUNUSED volatile void *arg)
@@ -192,6 +192,18 @@ static void unload(void)
 	timer_stop(tid);
 }
 
+#ifdef GINT_BOOT_LOG
+
+/* keysc_status() - status string of the driver */
+static const char *keysc_status(void)
+{
+	static char str[3] = "Sw";
+	if(isSH3()) str[0] = 's';
+	return str;
+}
+
+#endif /* GINT_BOOT_LOG */
+
 //---
 //	Driver structure definition
 //---
@@ -199,6 +211,7 @@ static void unload(void)
 gint_driver_t drv_keysc = {
 	.name		= "KEYSC",
 	.init		= init,
+	.status		= GINT_DRIVER_STATUS(keysc_status),
 	.unload		= unload,
 	.ctx_size	= 0,
 	.sys_ctx	= NULL,

src/render-fx/dpixel.c

@@ -6,7 +6,7 @@
 void dpixel(int x, int y, color_t color)
 {
 	/* Sanity checks */
-	if((uint)x >= 64 || (uint)y >= 128) return;
+	if((uint)x >= 128 || (uint)y >= 64) return;
 
 	uint32_t *lword = vram + (y << 2) + (x >> 5);
 	uint32_t mask = 1 << (~x & 31);

src/render-fx/topti.c

@@ -1,5 +1,6 @@
 #define GINT_NEED_VRAM
 #include <gint/defs/types.h>
+#include <gint/defs/attributes.h>
 #include <gint/display.h>
 #include "topti-asm.h"
 
@@ -8,6 +9,7 @@ extern font_t gint_font5x6;
 font_t const * topti_font = &gint_font5x6;
 
 /* dfont() - set the default font for text rendering */
+GSECTION(".pretext")
 void dfont(font_t const * font)
 {
 	topti_font = font ? font : &gint_font5x6;
@@ -28,6 +30,7 @@ enum charset
 /* charset_size(): Number of elements in each character set
    @set  Character set ID
    Returns the expected number of glyphs, -1 if charset ID is invalid. */
+GSECTION(".pretext")
 int charset_size(enum charset set)
 {
 	int size[] = { 10, 26, 52, 62, 95, 128 };
@@ -39,6 +42,7 @@ int charset_size(enum charset set)
    -1 if [c] is not part of that set.
    @set  Any character set
    @c    Character to decode */
+GSECTION(".pretext")
 int charset_decode(enum charset set, uint c)
 {
 	int x, y;
@@ -76,6 +80,7 @@ int charset_decode(enum charset set, uint c)
    @glyph  Glyph number obtained by charset_decode(), must be nonnegative.
    Returns the offset the this glyph's data in the font's data array. When
    using a proportional font, the size array is not heeded for. */
+GSECTION(".pretext")
 int topti_offset(font_t const *f, uint glyph)
 {
 	/* Non-proportional fonts don't need an index */
@@ -110,6 +115,7 @@ int topti_offset(font_t const *f, uint glyph)
    0, call topti_draw() and reset the operators. If it's neative, call
    topti_draw() then do another pass of topti_split() to recover the missing
    information. */
+GSECTION(".pretext")
 int topti_split(uint32_t const * glyph, int width, int height, int free,
 	uint32_t *operators)
 {
@@ -174,6 +180,7 @@ int topti_split(uint32_t const * glyph, int width, int height, int free,
    @f       Font
    @asm_fg  Assembler function for text rendering
    @asm_bg  Assembler function for background rendering */
+GSECTION(".pretext")
 void topti_render(int x, int y, const char *str, font_t const *f,
 	asm_text_t *asm_fg, asm_text_t *asm_bg)
 {
@@ -291,6 +298,7 @@ void dsize(const char *str, font_t const * f, int *w, int *h)
 }
 
 /* dtext() - display a string of text */
+GSECTION(".pretext")
 void dtext(int x, int y, const char *str, color_t fg, color_t bg)
 {
 	if((uint)fg >= 8 || (uint)bg >= 8) return;

src/std/string.c

@@ -0,0 +1,96 @@
+//---
+//	gint:core:string - replicas of a few string functions
+//---
+
+#include <gint/defs/types.h>
+#include <gint/defs/attributes.h>
+#include <stdarg.h>
+
+GWEAK size_t strlen(const char *str)
+{
+	int len = 0;
+	while(str[len]) len++;
+	return len;
+}
+
+/* vsprintf() - a trimmed-down version of the function
+   This function supports formats '%%', '%nd', '%nx' and '%s' where 'n' is a
+   1-digit size, and is mandatory. For '%d' and '%x', '0' is always set.
+   Always outputs exactly the requested number of characters, even if it's not
+   enough to completely print the value.
+   Does whatever it wants if the format is invalid. This is really a basic
+   function to format output without needing 18 kB of code. */
+GWEAK void vsprintf(char *str, const char *format, va_list args)
+{
+	#define in() (c = *format++)
+
+	const char *digits = "0123456789abcdef";
+	int c, len;
+
+	while(in())
+	{
+		if(c != '%')
+		{
+			*str++ = c;
+			continue;
+		}
+		in();
+
+		/* Length indications (only one character, not '%12d') */
+		if(c >= '0' && c <= '9') len = c - '0', in();
+		else len = -1;
+
+		if(c == '%')
+		{
+			*str++ = '%';
+		}
+		else if(c == 'd')
+		{
+			int n = va_arg(args, int);
+			if(n < 0) *str++ = '-', n = -n, len--;
+
+			for(int i = len - 1; i >= 0; i--)
+			{
+				int m = n / 10;
+				str[i] = digits[n - 10 * m];
+				n = m;
+			}
+			str += len;
+		}
+		else if(c == 'x')
+		{
+			uint32_t n = va_arg(args, uint32_t);
+
+			for(int i = len - 1; i >= 0; i--)
+			{
+				str[i] = digits[n & 0xf];
+				n >>= 4;
+			}
+			str += len;
+		}
+		else if(c == 'c')
+		{
+			int c = va_arg(args, int);
+			*str++ = c;
+		}
+		else if(c == 's')
+		{
+			const char *s = va_arg(args, const char *);
+			while(*s && len) *str++ = *s++, len--;
+		}
+	}
+
+	*str = 0;
+
+	#undef in
+	#undef out
+}
+
+/* sprintf() */
+GWEAK void sprintf(char *str, const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+	vsprintf(str, format, args);
+	va_end(args);
+}

src/t6k11/t6k11.c

@@ -198,6 +198,21 @@ static void ctx_restore(void *buf)
 	command(reg_counter, cnt);
 }
 
+//---
+//	Driver status string
+//---
+
+#ifdef GINT_BOOT_LOG
+
+/* t6k11_status() - status string of the driver */
+static const char *t6k11_status(void)
+{
+	/* TODO: t6k11: Detect backlight existence */
+	return "6K11-cB";
+}
+
+#endif /* GINT_BOOT_LOG */
+
 //---
 //	Driver structure definition
 //---
@@ -205,6 +220,7 @@ static void ctx_restore(void *buf)
 gint_driver_t drv_t6k11 = {
 	.name		= "T6K11",
 	.init		= NULL,
+	.status		= GINT_DRIVER_STATUS(t6k11_status),
 	.ctx_size	= sizeof(ctx_t),
 	.sys_ctx	= &sys_ctx,
 	.ctx_save	= ctx_save,

src/tmu/tmu.c

@@ -367,6 +367,50 @@ static void init(void)
 	}
 }
 
+//---
+//	Status function
+//---
+
+#ifdef GINT_BOOT_LOG
+
+/* tmu_status() - status string of extra TMUs for the boot log
+   The status string has a two-character code for each of the extra timers.
+
+   The first character is a digit character describing a value between 0 and 7.
+   * Bit 0 is set if TCOR=0xffffffff
+   * Bit 1 is set if TCNT=0xffffffff
+   * Bit 2 is set if TSTR=0
+
+   The second character indicates the status of interrupts.
+   * "D" (Disabled) if UNIE=0, UNF=0
+   * "L" (Low)      if UNIE=1, UNF=0
+   * "H" (High)     if UNIE=1, UNF=1
+   * "!" (Error)    if UNIE=0, UNF=1
+
+   So the normal status string would be made of "7D"'s. */
+static const char *tmu_status(void)
+{
+	static char status[18] = "ETMU ";
+
+	int j = 5;
+	for(int i = 3; i < timer_count(); i++)
+	{
+		tmu_extra_t *t = timers[i].tmu;
+		int v1 = (!(t->TCOR + 1))
+		       | (!(t->TCNT + 1) << 1)
+		       | (!(t->TSTR) << 2);
+		int v2 = (t->TCR.UNF << 1) | (t->TCR.UNIE);
+
+		status[j++] = '0' + v1;
+		status[j++] = "DLH!"[v2];
+	}
+	status[j] = 0;
+
+	return status;
+}
+
+#endif /* GINT_BOOT_LOG */
+
 //---
 //	Context system for this driver
 //---
@@ -444,6 +488,7 @@ gint_driver_t drv_tmu = {
 	.name		= "TMU",
 	.driver_sh3	= GINT_DRIVER_SH3(driver_sh3),
 	.init		= init,
+	.status		= GINT_DRIVER_STATUS(tmu_status),
 	.ctx_size	= sizeof(ctx_t),
 	.sys_ctx	= &sys_ctx,
 	.ctx_save	= ctx_save,