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/*
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
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