Vhex is a kernel which provide development and retro ingenierie platform for the Casio's OS
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#include <stdint.h>
#include <kernel/hardware/mpu.h>
/* check_sh3 - Detecting sh3-based MPU */
static mpu_t check_sh3(uint16_t tplcr)
{
if (tplcr == 0x0fff)
return (MPU_SH7337);
if (tplcr == 0x00ff)
return (MPU_SH7355);
return (MPU_UNKNOWN);
}
/* check_sh3 - Detecting sh4-based MPU */
static mpu_t check_sh4(void)
{
volatile uint32_t *pvr = (void *)0xff000030;
volatile uint32_t *prr = (void *)0xff000044;
uint32_t product;
if ((*pvr & 0xffffff00) != 0x10300b00)
return (MPU_UNKNOWN);
product = *prr & 0xfffffff0;
if (product == 0x00002c00)
return (MPU_SH7305);
if (product == 0x00002200)
return (MPU_SH7724);
return (MPU_UNKNOWN);
}
//
// get_mpu()
//
// Return the MPU identifier of the calculator.
// Thanks to SimonLothar and Lephenixnoir for this function
// and related information.
//
// Processor version register (PVR) and product control register (PRR)
// hold information about the MPU version, they but are only accessible on
// SH-4-based MPUs.
// To detect SH-3-based MPUs, this function uses port L control register
// (PLCR), whose bits 8 to 15 cannot be set with SH7337 where bits 8 to 11
// can be set with SH7355.
//
// Additionally, the CPU core ID register (CPIDR) at 0xff000048 returns 1
// on SH7305.
//
mpu_t mpu_get(void)
{
volatile uint16_t *plcr = (void *)0xa4000114;
uint16_t splcr;
uint16_t tplcr;
mpu_t mpu;
// Check port L control register.
splcr = *plcr;
*plcr = 0xffff;
tplcr = *plcr;
*plcr = splcr;
mpu = check_sh3(tplcr);
if (mpu != MPU_UNKNOWN)
return (mpu);
return (check_sh4());
}