127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
//---
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// gint:core:kernel - Installing and unloading the library
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//---
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#include <gint/gint.h>
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#include <gint/drivers.h>
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#include <gint/hardware.h>
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#include <gint/mmu.h>
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#include <gint/mpu/intc.h>
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#include <gint/kmalloc.h>
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#include <gint/cpu.h>
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#include <string.h>
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#include <stdlib.h>
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#include "vbr.h"
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#include "kernel.h"
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/* Reference the CPU and INTC drivers which are required for gint to work */
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extern gint_driver_t drv_intc, drv_cpu;
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GUNUSED gint_driver_t *gint_required_cpu = &drv_cpu;
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GUNUSED gint_driver_t *gint_required_intc = &drv_intc;
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/* World buffers for the OS and gint */
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gint_world_t gint_world_os = NULL;
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gint_world_t gint_world_addin = NULL;
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/* Dynamic flags for all drivers */
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uint8_t *gint_driver_flags = NULL;
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//---
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// Initialization and unloading
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//---
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/* kinit(): Install and start gint */
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void kinit(void)
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{
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uint32_t VBR = 0;
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#ifdef FX9860G
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/* On fx-9860G, VBR is loaded at the end of the user RAM. On SH4, the
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end of the user RAM hosts the stack, for which we leave 8 kB
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(0x2000 bytes). The VBR space takes about 0x600 bytes on SH3 due to
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the compact scheme, while it uses about 0x1100 bytes for the whole
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expanded region. */
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uint32_t uram_end = (uint32_t)mmu_uram() + mmu_uram_size();
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if(isSH4()) uram_end -= 0x2000;
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uram_end -= (isSH3() ? 0x600 : 0x1100);
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/* VBR is advanced 0x100 bytes because of an unused gap */
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VBR = uram_end - 0x100;
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#endif /* FX9860G */
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#ifdef FXCG50
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/* On fx-CG 50, VBR is loaded at the start of the user RAM; the linker
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script leaves 5 kB (0x1400 bytes) before the start of the data
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segment. The stack is again placed at the end of the region, and we
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leave 16 kB. */
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VBR = (uint32_t)mmu_uram();
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uint32_t uram_end = (uint32_t)mmu_uram() + mmu_uram_size() - 0x4000;
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#endif
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/* Event handler entry points */
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void *inth_entry = isSH3() ? gint_inth_7705 : gint_inth_7305;
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uint32_t exch_size = (uint32_t)&gint_exch_size;
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uint32_t tlbh_size = (uint32_t)&gint_tlbh_size;
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/* Load the event handler entry points into memory */
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memcpy((void *)VBR + 0x100, gint_exch, exch_size);
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memcpy((void *)VBR + 0x400, gint_tlbh, tlbh_size);
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memcpy((void *)VBR + 0x600, inth_entry, 64);
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/* Initialize memory allocators */
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kmalloc_init();
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/* Create an allocation arena with unused static RAM */
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static kmalloc_arena_t static_ram = { 0 };
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extern uint32_t euram;
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static_ram.name = "_uram";
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static_ram.is_default = isSH4();
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static_ram.start = mmu_uram() + ((uint32_t)&euram - 0x08100000);
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static_ram.end = (void *)uram_end;
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kmalloc_init_arena(&static_ram, true);
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kmalloc_add_arena(&static_ram);
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/* Allocate world buffers for the OS and for gint */
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gint_world_os = gint_world_alloc();
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gint_world_addin = gint_world_alloc();
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gint_driver_flags = malloc(gint_driver_count());
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if(!gint_world_os || !gint_world_addin || !gint_driver_flags)
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{
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extern void gint_panic(uint32_t code);
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gint_panic(0x1060);
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}
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/* Initialize drivers */
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for(int i = 0; i < gint_driver_count(); i++)
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{
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gint_driver_t *d = &gint_drivers[i];
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if(d->constructor) d->constructor();
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uint8_t *f = &gint_driver_flags[i];
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*f = (d->flags & GINT_DRV_INIT_) | GINT_DRV_CLEAN;
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}
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/* Select the VBR address for this world before configuring */
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cpu_configure_VBR(VBR);
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gint_world_switch_in(gint_world_os, gint_world_addin);
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}
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/* kquit(): Quit gint and give back control to the system */
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void kquit(void)
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{
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gint_world_switch_out(gint_world_addin, gint_world_os);
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gint_world_free(gint_world_os);
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gint_world_free(gint_world_addin);
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free(gint_driver_flags);
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gint_world_os = NULL;
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gint_world_addin = NULL;
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gint_driver_flags = NULL;
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}
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