7 Commits

Author	SHA1	Message	Date
Lephe	162b11cc73	kmalloc: create the kmalloc interface ... This change introduces a centralized memory allocator in the kernel. This interface can call into multiple arenas, including the default OS heap and planned arenas managed by a gint algorithm. The main advantage of this method is that it allows the heap to be extended over previously-unused areas of RAM such as the end of the static RAM region (apart from where the stack resides). Not using the OS heap is also sometimes a matter of correctness since on some OS versions the heap is known to fragment badly and degrade over time. I hope the deep control this interfaces gives over meomry allocation will allow very particular applications like object-specific allocators in fragmented SPU memory. This change does not introduce any new algorithm or arena so programs should behave exactly as before.	2021-03-12 17:24:49 +01:00
Lephe	3885f10ee1	kernel: move VBR at the end of the user RAM area on fx-9860G ... This leaves more space available for the heap.	2021-02-15 09:46:59 +01:00
Lephe	ad6c108dfc	kernel: always pull the INTC driver ... Some very trivial applications might not require its symbols explicitly, thus the need to force a dependency (otherwise OS interrupts such as the KEYSC are not disabled and crash the handler very quickly).	2020-10-28 10:01:55 +01:00
Lephe	e63ff8351b	dsp: enable integrated DSP in SR at startup	2020-10-09 18:58:43 +02:00
Lephe	744d243265	kernel: do SH3 initialization before context saves ... This should be obvious and breaks ctx_save() for the RTC and TMU. Which apparently never came up during testing.	2020-09-28 14:01:32 +02:00
Lephe	e5abe03b89	kernel: dynamic loading of GMAPPED functions to user RAM ... This commit introduces a large architectural change. Unlike previous models of the fx-9860G series, the G-III models have a new user RAM address different from 8801c000. The purpose of this change is to dynamically load GMAPPED functions to this address by querying the TLB, and call them through a function pointer whose address is determined when loading. Because of the overhead of using a function pointer in both assembly and C code, changes have been made to avoid GMAPPED functions altogether. Current, only cpu_setVBR() and gint_inth_callback() are left, the second being used specifically to enable TLB misses when needed. * Add a .gint.mappedrel section for the function pointers holding addresses to GMAPPED functions; add function pointers for cpu_setVBR() and gint_inth_callback() * Move rram to address 0 instead of the hardcoded 0x8801c000 * Load GMAPPED functions at their linked address + the physical address user RAM is mapped, to and compute their function pointers * Remove the GMAPPED macro since no user function needs it anymore * Add section flags "ax" (code) or "aw" (data) to every custom .section in assembler code, as they default to unpredictable values that can cause the section to be marked NOLOAD by the linker * Update the main kernel, TMU, ETMU and RTC interrupt handlers to use the new indirect calling method This is made possible by new MMU functions giving direct access to the physical area behind any virtualized page. * Add an mmu_translate() function to query the TLB * Add an mmu_uram() function to access user RAM from P1 The exception catching mechanism has been modified to avoid the use of GMAPPED functions altogether. * Set SR.BL=0 and SR.IMASK=15 before calling exception catchers * Move gint_exc_skip() to normal text ROM * Also fix registers not being popped off the stack before a panic The timer drivers have also been modified to avoid GMAPPED functions. * Invoke timer_stop() through gint_inth_callback() and move it to ROM * Move and expand the ETMU driver to span 3 blocks at 0xd00 (ETMU4) * Remove the timer_clear() function by inlining it into the ETMU handler (TCR is provided within the storage block of each timer) * Also split src/timer/inth.s into src/timer/inth-{tmu,etmu}.s Additionally, VBR addresses are now determined at runtime to further reduce hardcoded memory layout addresses in the linker script. * Determine fx-9860G VBR addresses dynamically from mmu_uram() * Determine fx-CG 50 VBR addresses dynamically from mmu_uram() * Remove linker symbols for VBR addresses Comments and documentation have been updated throughout the code to reflect the changes.	2020-09-17 14:48:54 +02:00
Lephe	7b4eb078c4	move src/core to src/kernel	2020-07-26 11:49:33 +02:00

Renamed from src/core/kernel.c (Browse further)