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/* 2005.6 by yhlu
* 2006.3 yhlu add copy data from CAR to ram
*/
#include "cpu/amd/car/disable_cache_as_ram.c"
#include "cpu/amd/car/clear_init_ram.c"
static inline void print_debug_pcar(const char *strval, uint32_t val)
{
#if CONFIG_USE_INIT
printk_debug("%s%08x\r\n", strval, val);
#else
print_debug(strval); print_debug_hex32(val); print_debug("\r\n");
#endif
}
static void inline __attribute__((always_inline)) memcopy(void *dest, const void *src, unsigned long bytes)
{
__asm__ volatile(
"cld\n\t"
"rep movsl\n\t"
: /* No outputs */
: "S" (src), "D" (dest), "c" ((bytes)>>2)
);
}
static void post_cache_as_ram(void)
{
#if 1
{
/* Check value of esp to verify if we have enough rom for stack in Cache as RAM */
unsigned v_esp;
__asm__ volatile (
"movl %%esp, %0\n\t"
: "=a" (v_esp)
);
print_debug_pcar("v_esp=", v_esp);
}
#endif
unsigned testx = 0x5a5a5a5a;
print_debug_pcar("testx = ", testx);
/* copy data from cache as ram to
ram need to set CONFIG_LB_MEM_TOPK to 2048 and use var mtrr instead.
*/
#if CONFIG_LB_MEM_TOPK <= 1024
#error "You need to set CONFIG_LB_MEM_TOPK greater than 1024"
#endif
set_init_ram_access();
print_debug("Copying data from cache to ram -- switching to use ram as stack... ");
/* from here don't store more data in CAR */
__asm__ volatile (
"pushl %eax\n\t"
);
memcopy((CONFIG_LB_MEM_TOPK<<10)-DCACHE_RAM_SIZE, DCACHE_RAM_BASE, DCACHE_RAM_SIZE); //inline
__asm__ volatile (
/* set new esp */ /* before _RAMBASE */
"subl %0, %%ebp\n\t"
"subl %0, %%esp\n\t"
::"a"( (DCACHE_RAM_BASE + DCACHE_RAM_SIZE)- (CONFIG_LB_MEM_TOPK<<10) )
); // We need to push %eax to the stack (CAR) before copy stack and pop it later after copy stack and change esp
__asm__ volatile (
"popl %eax\n\t"
);
/* We can put data to stack again */
/* only global variable sysinfo in cache need to be offset */
print_debug("Done\r\n");
print_debug_pcar("testx = ", testx);
print_debug("Disabling cache as ram now \r\n");
disable_cache_as_ram_bsp();
print_debug("Clearing initial memory region: ");
clear_init_ram(); //except the range from [(CONFIG_LB_MEM_TOPK<<10) - DCACHE_RAM_SIZE, (CONFIG_LB_MEM_TOPK<<10)), that is used as stack in ram
print_debug("Done\r\n");
/*copy and execute linuxbios_ram */
copy_and_run();
/* We will not return */
print_debug("should not be here -\r\n");
}
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