117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
/*
|
|
libco.arm (2016-08-14)
|
|
author: frangarcj
|
|
license: public domain
|
|
*/
|
|
|
|
#define LIBCO_C
|
|
#include "libco.h"
|
|
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <psp2/kernel/sysmem.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
static inline int align(int x, int n) {
|
|
return (((x >> n) + 1) << n );
|
|
}
|
|
#define FOUR_KB_ALIGN(x) align(x, 12)
|
|
#define MB_ALIGN(x) align(x, 20)
|
|
|
|
static thread_local unsigned long co_active_buffer[64];
|
|
static thread_local cothread_t co_active_handle = 0;
|
|
static void (*co_swap)(cothread_t, cothread_t) = 0;
|
|
static int block;
|
|
static uint32_t co_swap_function[] = {
|
|
0xe8a16ff0, /* stmia r1!, {r4-r11,sp,lr} */
|
|
0xe8b0aff0, /* ldmia r0!, {r4-r11,sp,pc} */
|
|
0xe12fff1e, /* bx lr */
|
|
};
|
|
|
|
void co_init() {
|
|
int ret;
|
|
void *base;
|
|
|
|
block = sceKernelAllocMemBlockForVM("libco", MB_ALIGN(FOUR_KB_ALIGN(sizeof co_swap_function)));
|
|
if (block < 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// get base address
|
|
ret = sceKernelGetMemBlockBase(block, &base);
|
|
if (ret < 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// set domain to be writable by user
|
|
ret = sceKernelOpenVMDomain();
|
|
if (ret < 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
|
|
memcpy(base,co_swap_function,sizeof co_swap_function);
|
|
|
|
// set domain back to read-only
|
|
ret = sceKernelCloseVMDomain();
|
|
if (ret < 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// flush icache
|
|
ret = sceKernelSyncVMDomain(block, base, MB_ALIGN(FOUR_KB_ALIGN(sizeof co_swap_function)));
|
|
if (ret < 0)
|
|
{
|
|
return;
|
|
}
|
|
|
|
co_swap = (void (*)(cothread_t, cothread_t))base;
|
|
|
|
|
|
}
|
|
|
|
cothread_t co_active() {
|
|
if(!co_active_handle) co_active_handle = &co_active_buffer;
|
|
return co_active_handle;
|
|
}
|
|
|
|
cothread_t co_create(unsigned int size, void (*entrypoint)(void)) {
|
|
unsigned long* handle = 0;
|
|
if(!co_swap) {
|
|
co_init();
|
|
}
|
|
if(!co_active_handle) co_active_handle = &co_active_buffer;
|
|
size += 256;
|
|
size &= ~15;
|
|
|
|
if((handle = (unsigned long*)malloc(size))) {
|
|
unsigned long* p = (unsigned long*)((unsigned char*)handle + size);
|
|
handle[8] = (unsigned long)p;
|
|
handle[9] = (unsigned long)entrypoint;
|
|
}
|
|
|
|
return handle;
|
|
}
|
|
|
|
void co_delete(cothread_t handle) {
|
|
free(handle);
|
|
}
|
|
|
|
void co_switch(cothread_t handle) {
|
|
cothread_t co_previous_handle = co_active_handle;
|
|
co_swap(co_active_handle = handle, co_previous_handle);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|