mirror of
https://github.com/libretro/RetroArch
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113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
/*
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libco.arm (2015-06-18)
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license: public domain
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*/
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#define LIBCO_C
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#include "libco.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <psp2/kernel/sysmem.h>
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#include <stdio.h>
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#include <string.h>
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#define FOUR_KB_ALIGN(x) align(x, 12)
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#define MB_ALIGN(x) align(x, 20)
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#ifdef __cplusplus
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extern "C" {
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#endif
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static inline int align(int x, int n)
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{
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return (((x >> n) + 1) << n);
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}
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static thread_local unsigned long co_active_buffer[64];
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static thread_local cothread_t co_active_handle = 0;
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static void(*co_swap)(cothread_t, cothread_t) = 0;
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static int block;
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static uint32_t co_swap_function[] = {
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0xe8a16ff0, /* stmia r1!, {r4-r11,sp,lr} */
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0xe8b0aff0, /* ldmia r0!, {r4-r11,sp,pc} */
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0xe12fff1e, /* bx lr */
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};
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static void co_init(void)
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{
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int ret;
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void *base;
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block = sceKernelAllocMemBlockForVM("libco",
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MB_ALIGN(FOUR_KB_ALIGN(sizeof co_swap_function)));
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if (block < 0)
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return;
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/* Get base address */
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if ((ret = sceKernelGetMemBlockBase(block, &base)) < 0)
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return;
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/* Set domain to be writable by user */
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if ((ret = sceKernelOpenVMDomain()) < 0)
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return;
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memcpy(base, co_swap_function, sizeof co_swap_function);
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/* Set domain back to read-only */
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if ((ret = sceKernelCloseVMDomain()) < 0)
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return;
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/* Flush icache */
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ret = sceKernelSyncVMDomain(block, base,
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MB_ALIGN(FOUR_KB_ALIGN(sizeof co_swap_function)));
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if (ret < 0)
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return;
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co_swap = (void(*)(cothread_t, cothread_t))base;
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}
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cothread_t co_active(void)
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{
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if (!co_active_handle)
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co_active_handle = &co_active_buffer;
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return co_active_handle;
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}
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cothread_t co_create(unsigned int size, void(*entrypoint)(void))
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{
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unsigned long* handle = 0;
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if (!co_swap)
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co_init();
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if (!co_active_handle)
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co_active_handle = &co_active_buffer;
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size += 256;
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size &= ~15;
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if ((handle = (unsigned long*)malloc(size)))
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{
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unsigned long *p = (unsigned long*)((unsigned char*)handle + size);
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handle[8] = (unsigned long)p;
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handle[9] = (unsigned long)entrypoint;
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}
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return handle;
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}
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void co_delete(cothread_t handle)
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{
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free(handle);
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sceKernelFreeMemBlock(block);
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}
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void co_switch(cothread_t handle)
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{
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cothread_t co_previous_handle = co_active_handle;
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co_swap(co_active_handle = handle, co_previous_handle);
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}
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#ifdef __cplusplus
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}
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#endif
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