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/*
* This file is part of the coreboot project.
*
* Copyright 2015 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/early_variables.h>
#include <console/console.h>
#include <cpu/x86/mtrr.h>
#include <fsp/car.h>
#include <fsp/util.h>
#include <program_loading.h>
#include <timestamp.h>
FSP_INFO_HEADER *fih_car CAR_GLOBAL;
/* Save FSP_INFO_HEADER for TempRamExit() call in assembly. */
static inline void set_fih_car(FSP_INFO_HEADER *fih)
{
/* This variable is written in the raw form because it's only
* ever accessed in code that that has the cache-as-ram enabled. The
* assembly routine which tears down cache-as-ram utilizes this
* variable for determining where to find FSP. */
fih_car = fih;
}
asmlinkage void *cache_as_ram_main(struct cache_as_ram_params *car_params)
{
int i;
const int num_guards = 4;
const u32 stack_guard = 0xdeadbeef;
u32 *stack_base;
void *ram_stack;
u32 size;
/* Size of unallocated CAR. */
size = _car_region_end - _car_relocatable_data_end;
size = ALIGN_DOWN(size, 16);
stack_base = (u32 *) (_car_region_end - size);
for (i = 0; i < num_guards; i++)
stack_base[i] = stack_guard;
/* Initialize timestamp book keeping only once. */
timestamp_init(car_params->tsc);
/* Call into pre-console init code then initialize console. */
car_soc_pre_console_init();
car_mainboard_pre_console_init();
console_init();
printk(BIOS_DEBUG, "FSP TempRamInit successful\n");
printk(BIOS_SPEW, "bist: 0x%08x\n", car_params->bist);
printk(BIOS_SPEW, "tsc: 0x%016llx\n", car_params->tsc);
if (car_params->bootloader_car_start != CONFIG_DCACHE_RAM_BASE ||
car_params->bootloader_car_end !=
(CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE)) {
printk(BIOS_INFO, "CAR mismatch: %08x--%08x vs %08lx--%08lx\n",
CONFIG_DCACHE_RAM_BASE,
CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE,
(long)car_params->bootloader_car_start,
(long)car_params->bootloader_car_end);
}
car_soc_post_console_init();
car_mainboard_post_console_init();
set_fih_car(car_params->fih);
/* Return new stack value in RAM back to assembly stub. */
ram_stack = cache_as_ram_stage_main(car_params->fih);
/* Check the stack. */
for (i = 0; i < num_guards; i++) {
if (stack_base[i] == stack_guard)
continue;
printk(BIOS_DEBUG, "Smashed stack detected in romstage!\n");
}
return ram_stack;
}
/* Entry point taken when romstage is called after a separate verstage. */
asmlinkage void *romstage_c_entry(void)
{
/* Need to locate the current FSP_INFO_HEADER. The cache-as-ram
* is still enabled. We can directly access work buffer here. */
FSP_INFO_HEADER *fih;
struct prog fsp = PROG_INIT(PROG_REFCODE, "fsp.bin");
console_init();
if (prog_locate(&fsp)) {
fih = NULL;
printk(BIOS_ERR, "Unable to locate %s\n", prog_name(&fsp));
} else
/* This leaks a mapping which this code assumes is benign as
* the flash is memory mapped CPU's address space. */
fih = find_fsp((uintptr_t)rdev_mmap_full(prog_rdev(&fsp)));
set_fih_car(fih);
/* Return new stack value in RAM back to assembly stub. */
return cache_as_ram_stage_main(fih);
}
asmlinkage void after_cache_as_ram(void *chipset_context)
{
timestamp_add_now(TS_FSP_TEMP_RAM_EXIT_END);
printk(BIOS_DEBUG, "FspTempRamExit returned successfully\n");
display_mtrrs();
after_cache_as_ram_stage();
}
void __weak car_mainboard_pre_console_init(void)
{
}
void __weak car_soc_pre_console_init(void)
{
}
void __weak car_mainboard_post_console_init(void)
{
}
void __weak car_soc_post_console_init(void)
{
}
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