67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
//---
|
|
// vhex:core:hardware - Platform information and hardware detection
|
|
//---
|
|
#include "vhex/mpu/sh7305/pfc.h"
|
|
#include "vhex/arch/fxcg50/hardware.h"
|
|
#include "vhex/hardware.h"
|
|
#include "vhex/mmu.h"
|
|
|
|
|
|
/* Holds information about the current platform */
|
|
uintptr_t vhex[HW_KEYS];
|
|
|
|
/* Processor Version Register */
|
|
#define PVR (*((volatile uint32_t *)0xff000030))
|
|
/* Product Register */
|
|
#define PRR (*((volatile uint32_t *)0xff000044))
|
|
|
|
|
|
|
|
/* ram_get_size() : try to determine the RAM size */
|
|
static ptrdiff_t ram_get_size(uintptr_t start_ram)
|
|
{
|
|
volatile uint32_t *ptr = (void*)start_ram;
|
|
volatile uint32_t *tst = (void*)start_ram;
|
|
uintptr_t backup;
|
|
|
|
//TODO: use UTLB page size information to walk through each pages
|
|
while (1) {
|
|
ptr = &ptr[4096];
|
|
backup = ptr[0];
|
|
ptr[0] = 0xdeadbeef;
|
|
if (ptr[0] != 0xdeadbeef || ptr[0] == tst[0]) break;
|
|
ptr[0] = backup;
|
|
}
|
|
ptr[0] = backup;
|
|
return ((ptrdiff_t)((uintptr_t)ptr - (uintptr_t)tst));
|
|
}
|
|
|
|
|
|
|
|
/* hw_detect(): Basic hardware detection */
|
|
void hw_detect(void)
|
|
{
|
|
/* get MPU and CPU information */
|
|
vhex[HWMPU] = HWMPU_SH7305;
|
|
vhex[HWCPUVR] = PVR;
|
|
vhex[HWCPUPR] = PRR;
|
|
|
|
/* We can differentiate the Prizm device from the fxcg50 device by
|
|
checking its stack */
|
|
uintptr_t stack;
|
|
__asm__("mov r15, %0" : "=r"(stack));
|
|
|
|
/* detect the device type */
|
|
vhex[HWDEVICE] = HWDEVICE_FXCG50;
|
|
if (stack < 0x8c000000)
|
|
vhex[HWDEVICE] = HWDEVICE_PRIZM;
|
|
if (PVR == 0x00000000)
|
|
vhex[HWDEVICE] = HWDEVICE_FXCG_MANAGER;
|
|
|
|
/* detect the RAM geometry */
|
|
uintptr_t uram = mmu_translate(0x08100000, NULL);
|
|
vhex[HWRAM_PHY_USER] = uram;
|
|
vhex[HWRAM_PHY_ORIGIN] = uram & 0xff000000;
|
|
vhex[HWRAM_PHY_SIZE] = ram_get_size(uram | 0xa0000000);
|
|
}
|