/*
* boot でメモリを使用する機構の初期化。
*
* 第１引数で指定したメモリの最後から、第２引数で指定した分だけを
* malloc で使用する。
*
*/
static void
init_malloc (void *last, int size)
{
(BYTE *)alloc_reg = (BYTE *)last - size;
alloc_reg->size = size;
alloc_reg->next = alloc_reg;
#ifdef nodef
boot_printf ("init_malloc: last = 0x%x\n", last);
boot_printf ("init_malloc: alloc_reg = 0x%x\n", alloc_reg);
boot_printf ("init_malloc: alloc_reg->size = %d\n", alloc_reg->size);
boot_printf ("init_malloc: alloc_reg->next = 0x%x\n", alloc_reg->next);
#endif
}
void bootloader_main(void) {
/* Init hardware */
hw_init();
/* Initialize elf-loader environment */
init_elf_loader();
/* Load the nano kernel. Doing this will install exception vectors */
boot_printf("Boot: loading nano kernel ...\n");
nano_init_t * nano_init = (nano_init_t *)load_nano(); //We have to rederive this as an executable cap
nano_init = (nano_init_t*)cheri_setoffset(cheri_getpcc(),cheri_getoffset(nano_init));
/* TODO: we could have some boot exception vectors if we want exception handling in boot. */
/* These should be in ROM as a part of the boot image (i.e. make a couple more dedicated sections */
cp0_status_bev_set(0);
boot_printf("Boot: loading kernel ...\n");
size_t entry = load_kernel();
boot_printf("Boot: loading init ...\n");
boot_info_t *bi = load_init();
size_t invalid_length = bi->init_end;
capability phy_start = cheri_setbounds(cheri_setoffset(cheri_getdefault(), MIPS_KSEG0), invalid_length);
/* Do we actually need this? */
//boot_printf("Invalidating %p length %lx:\n", phy_start, invalid_length);
//caches_invalidate(phy_start, invalid_length);
register_t mem_size = bi->init_end - bi->nano_end;
/* Jumps to the nano kernel init. This will completely destroy boot and so we can never return here.
* All registers will be cleared apart from a specified few. mem_size of memory will be left unmanaged and the
* rest will be returned as a reservation. The third argument is an extra argument to the kernel */
boot_printf("Jumping to nano kernel...\n");
BOOT_PRINT_CAP(nano_init);
nano_init(mem_size, entry, bi->init_begin - bi->kernel_begin, bi->init_entry);
}
/**************************************************************************
* init_memory
*
*
*/
void
init_memory (void)
{
volatile int *p;
last_addr = (void *)&end;
#ifdef PC9801
outb (0x00f2, 0); /* 1M 以上の領域を使用できるようにする。*/
#elif IBMPC
/* IBMPC (互換機) で A20 をイネーブルにする。
* 0xD1 -> out (0x64)
* 0xDF -> out (0x60)
*/
enable_A20 ();
#endif
for (p = (int *)0x100000; (int)p < 0xf000000; (int)p += 0x100000)
{
*p = 0;
*p = 0xAA;
if (*p != 0xAA)
break;
}
boot_printf ("Extended Memory = %d K bytes\n", ((int)p - 0x100000) / 1000);
boot_printf ("USE Memory = %d bytes\n", last_addr);
ext_mem = ((int)p - 0x100000);
base_mem = BASE_MEM;
real_mem = ext_mem + BASE_MEM;
#ifdef nodef
/* malloc 機構の初期化 */
init_malloc ((void *)(2 * 1024 * 1024), MALLOC_SIZE);
#endif
/* 640K バイトから下位 100 K バイトの領域を malloc 用に使用する */
init_malloc ((void *)(640 * 1024), MALLOC_SIZE);
}
