void fatal_error(unsigned long exception_handler, unsigned long exception_at,
unsigned long return_address)
{
/* Just in case we are totally messed up */
early_mainboard_init();
displayinit();
printk("\n\nFault: 0x%0lx\n", exception_handler);
printk("PC: 0x%0lx\n", exception_at);
printk("RA: 0x%0lx\n", return_address);
/* Now spin forever */
while(1) {;}
}
static void __attribute__((noinline)) romstage(void)
{
timestamp_init(0);
timestamp_add_now(TS_START_ROMSTAGE);
console_init();
exception_init();
sdram_init(get_sdram_config());
/* used for MMU and CBMEM setup, in MB */
u32 dram_start_mb = (uintptr_t)_dram/MiB;
u32 dram_end_mb = sdram_max_addressable_mb();
u32 dram_size_mb = dram_end_mb - dram_start_mb;
configure_l2_cache();
mmu_init();
/* Device memory below DRAM is uncached. */
mmu_config_range(0, dram_start_mb, DCACHE_OFF);
/* SRAM is cached. MMU code will round size up to page size. */
mmu_config_range((uintptr_t)_sram/MiB, div_round_up(_sram_size, MiB),
DCACHE_WRITEBACK);
/* DRAM is cached. */
mmu_config_range(dram_start_mb, dram_size_mb, DCACHE_WRITEBACK);
/* A window for DMA is uncached. */
mmu_config_range((uintptr_t)_dma_coherent/MiB,
_dma_coherent_size/MiB, DCACHE_OFF);
/* The space above DRAM is uncached. */
if (dram_end_mb < 4096)
mmu_config_range(dram_end_mb, 4096 - dram_end_mb, DCACHE_OFF);
mmu_disable_range(0, 1);
dcache_mmu_enable();
/*
* A watchdog reset only resets part of the system so it ends up in
* a funny state. If that happens, we need to reset the whole machine.
*/
if (power_reset_status() == POWER_RESET_WATCHDOG) {
printk(BIOS_INFO, "Watchdog reset detected, rebooting.\n");
hard_reset();
}
/* FIXME: this may require coordination with moving timestamps */
cbmem_initialize_empty();
early_mainboard_init();
run_ramstage();
}