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re-import all libretro code from it's fork

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Verbatim copy from https://github.com/libretro/picodrive/ commit
9ae88ef15ff00cacc3877c7ecc13b0092bab50b8 , so look there for the history
of libretro specific changes. Unfortunately there is too much noise and
divergence to merge this in a proper way.
This commit is contained in:
notaz 2017-10-13 00:39:51 +03:00
parent 126eb5f469
commit 7612bf90be
17 changed files with 6402 additions and 1810 deletions
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78
platform/libretro/3ds/3ds_utils.c Normal file
View file

@ -0,0 +1,78 @@
#include "3ds_utils.h"
typedef int (*ctr_callback_type)(void);
int srvGetServiceHandle(unsigned int* out, const char* name);
int svcCloseHandle(unsigned int handle);
int svcBackdoor(ctr_callback_type);
static void ctr_enable_all_svc_kernel(void)
{
__asm__ volatile("cpsid aif");
unsigned int* svc_access_control = *(*(unsigned int***)0xFFFF9000 + 0x22) - 0x6;
svc_access_control[0]=0xFFFFFFFE;
svc_access_control[1]=0xFFFFFFFF;
svc_access_control[2]=0xFFFFFFFF;
svc_access_control[3]=0x3FFFFFFF;
}
static void ctr_invalidate_ICache_kernel(void)
{
__asm__ volatile(
"cpsid aif\n\t"
"mov r0, #0\n\t"
"mcr p15, 0, r0, c7, c5, 0\n\t");
}
static void ctr_flush_DCache_kernel(void)
{
__asm__ volatile(
"cpsid aif\n\t"
"mov r0, #0\n\t"
"mcr p15, 0, r0, c7, c10, 0\n\t");
}
static void ctr_enable_all_svc(void)
{
svcBackdoor((ctr_callback_type)ctr_enable_all_svc_kernel);
}
void ctr_invalidate_ICache(void)
{
// __asm__ volatile("svc 0x2E\n\t");
svcBackdoor((ctr_callback_type)ctr_invalidate_ICache_kernel);
}
void ctr_flush_DCache(void)
{
// __asm__ volatile("svc 0x4B\n\t");
svcBackdoor((ctr_callback_type)ctr_flush_DCache_kernel);
}
void ctr_flush_invalidate_cache(void)
{
ctr_flush_DCache();
ctr_invalidate_ICache();
}
int ctr_svchack_init(void)
{
extern unsigned int __service_ptr;
if(__service_ptr)
return 0;
/* CFW */
ctr_enable_all_svc();
return 1;
}