116 lines
2.3 KiB
C
116 lines
2.3 KiB
C
/*
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libco.arm (2016-08-14)
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author: frangarcj
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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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#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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return (((x >> n) + 1) << n );
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}
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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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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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void co_init() {
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int ret;
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void *base;
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block = sceKernelAllocMemBlockForVM("libco", MB_ALIGN(FOUR_KB_ALIGN(sizeof co_swap_function)));
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if (block < 0)
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{
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return;
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}
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// get base address
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ret = sceKernelGetMemBlockBase(block, &base);
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if (ret < 0)
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{
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return;
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}
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// set domain to be writable by user
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ret = sceKernelOpenVMDomain();
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if (ret < 0)
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{
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return;
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}
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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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ret = sceKernelCloseVMDomain();
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if (ret < 0)
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{
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return;
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}
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// flush icache
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ret = sceKernelSyncVMDomain(block, base, MB_ALIGN(FOUR_KB_ALIGN(sizeof co_swap_function)));
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if (ret < 0)
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{
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return;
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}
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co_swap = (void (*)(cothread_t, cothread_t))base;
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}
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cothread_t co_active() {
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if(!co_active_handle) 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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unsigned long* handle = 0;
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if(!co_swap) {
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co_init();
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}
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if(!co_active_handle) 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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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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free(handle);
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}
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void co_switch(cothread_t handle) {
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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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