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/*
* This file is part of the coreboot project.
*
* Copyright 2016 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/romstage.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/cpu.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <program_loading.h>
#include <rmodule.h>
#include <romstage_handoff.h>
#include <stage_cache.h>
#include <timestamp.h>
static inline void stack_push(struct postcar_frame *pcf, uint32_t val)
{
uint32_t *ptr;
pcf->stack -= sizeof(val);
ptr = (void *)pcf->stack;
*ptr = val;
}
static void postcar_frame_prepare(struct postcar_frame *pcf)
{
msr_t msr;
msr = rdmsr(MTRR_CAP_MSR);
pcf->upper_mask = (1 << (cpu_phys_address_size() - 32)) - 1;
pcf->max_var_mtrrs = msr.lo & MTRR_CAP_VCNT;
pcf->num_var_mtrrs = 0;
}
int postcar_frame_init(struct postcar_frame *pcf, size_t stack_size)
{
void *stack;
/*
* Use default postcar stack size of 4 KiB. This value should
* not be decreased, because if mainboards use vboot, 1 KiB will
* not be enough anymore.
*/
if (stack_size == 0)
stack_size = 4 * KiB;
stack = cbmem_add(CBMEM_ID_ROMSTAGE_RAM_STACK, stack_size);
if (stack == NULL) {
printk(BIOS_ERR, "Couldn't add %zd byte stack in cbmem.\n",
stack_size);
return -1;
}
postcar_frame_prepare(pcf);
pcf->stack = (uintptr_t)stack;
pcf->stack += stack_size;
return 0;
}
void postcar_frame_add_mtrr(struct postcar_frame *pcf,
uintptr_t addr, size_t size, int type)
{
/*
* Utilize additional MTRRs if the specified size is greater than the
* base address alignment.
*/
while (size != 0) {
uint32_t addr_lsb;
uint32_t size_msb;
uint32_t mtrr_size;
if (pcf->num_var_mtrrs >= pcf->max_var_mtrrs) {
printk(BIOS_ERR, "No more variable MTRRs: %d\n",
pcf->max_var_mtrrs);
return;
}
addr_lsb = fls(addr);
size_msb = fms(size);
/* All MTRR entries need to have their base aligned to the mask
* size. The maximum size is calculated by a function of the
* min base bit set and maximum size bit set. */
if (addr_lsb > size_msb)
mtrr_size = 1 << size_msb;
else
mtrr_size = 1 << addr_lsb;
printk(BIOS_DEBUG, "MTRR Range: Start=%lx End=%lx (Size %x)\n",
addr, addr + mtrr_size, mtrr_size);
stack_push(pcf, pcf->upper_mask);
stack_push(pcf, ~(mtrr_size - 1) | MTRR_PHYS_MASK_VALID);
stack_push(pcf, 0);
stack_push(pcf, addr | type);
pcf->num_var_mtrrs++;
size -= mtrr_size;
addr += mtrr_size;
}
}
void postcar_frame_add_romcache(struct postcar_frame *pcf, int type)
{
if (!CONFIG(BOOT_DEVICE_MEMORY_MAPPED))
return;
postcar_frame_add_mtrr(pcf, CACHE_ROM_BASE, CACHE_ROM_SIZE, type);
}
void postcar_frame_common_mtrrs(struct postcar_frame *pcf)
{
if (pcf->skip_common_mtrr)
return;
/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
postcar_frame_add_mtrr(pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
/* Cache the ROM as WP just below 4GiB. */
postcar_frame_add_romcache(pcf, MTRR_TYPE_WRPROT);
}
/* prepare_and_run_postcar() determines the stack to use after
* cache-as-ram is torn down as well as the MTRR settings to use. */
void prepare_and_run_postcar(struct postcar_frame *pcf)
{
if (postcar_frame_init(pcf, 0))
die("Unable to initialize postcar frame.\n");
fill_postcar_frame(pcf);
postcar_frame_common_mtrrs(pcf);
run_postcar_phase(pcf);
/* We do not return here. */
}
static void postcar_commit_mtrrs(struct postcar_frame *pcf)
{
/*
* Place the number of used variable MTRRs on stack then max number
* of variable MTRRs supported in the system.
*/
stack_push(pcf, pcf->num_var_mtrrs);
stack_push(pcf, pcf->max_var_mtrrs);
}
static void finalize_load(uintptr_t *stack_top_ptr, uintptr_t stack_top)
{
*stack_top_ptr = stack_top;
/*
* Signal to rest of system that another update was made to the
* postcar program prior to running it.
*/
prog_segment_loaded((uintptr_t)stack_top_ptr, sizeof(uintptr_t),
SEG_FINAL);
}
static void load_postcar_cbfs(struct prog *prog, struct postcar_frame *pcf)
{
struct rmod_stage_load rsl = {
.cbmem_id = CBMEM_ID_AFTER_CAR,
.prog = prog,
};
if (prog_locate(prog))
die_with_post_code(POST_INVALID_ROM,
"Failed to locate after CAR program.\n");
if (rmodule_stage_load(&rsl))
die_with_post_code(POST_INVALID_ROM,
"Failed to load after CAR program.\n");
/* Set the stack pointer within parameters of the program loaded. */
if (rsl.params == NULL)
die_with_post_code(POST_INVALID_ROM,
"No parameters found in after CAR program.\n");
finalize_load(rsl.params, pcf->stack);
stage_cache_add(STAGE_POSTCAR, prog);
}
void run_postcar_phase(struct postcar_frame *pcf)
{
struct prog prog =
PROG_INIT(PROG_POSTCAR, CONFIG_CBFS_PREFIX "/postcar");
postcar_commit_mtrrs(pcf);
if (!CONFIG(NO_STAGE_CACHE) &&
romstage_handoff_is_resume()) {
stage_cache_load_stage(STAGE_POSTCAR, &prog);
/* This is here to allow platforms to pass different stack
parameters between S3 resume and normal boot. On the
platforms where the values are the same it's a nop. */
finalize_load(prog.arg, pcf->stack);
} else
load_postcar_cbfs(&prog, pcf);
/* As postcar exist, it's end of romstage here */
timestamp_add_now(TS_END_ROMSTAGE);
prog_run(&prog);
}
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