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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/cpu.h>
#include <cbmem.h>
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <program_loading.h>
#include <rmodule.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;
}
int postcar_frame_init(struct postcar_frame *pcf, size_t stack_size)
{
void *stack;
msr_t msr;
msr = rdmsr(MTRR_CAP_MSR);
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;
}
pcf->stack = (uintptr_t)stack;
pcf->stack += stack_size;
pcf->upper_mask = (1 << (cpu_phys_address_size() - 32)) - 1;
pcf->max_var_mttrs = msr.lo & MTRR_CAP_VCNT;
pcf->num_var_mttrs = 0;
return 0;
}
void postcar_frame_add_mtrr(struct postcar_frame *pcf,
uintptr_t addr, size_t size, int type)
{
size_t align;
if (pcf->num_var_mttrs >= pcf->max_var_mttrs) {
printk(BIOS_ERR, "No more variable MTRRs: %d\n",
pcf->max_var_mttrs);
return;
}
/* Determine address alignment by lowest bit set in address. */
align = addr & (addr ^ (addr - 1));
if (align < size) {
printk(BIOS_ERR, "Address (%lx) alignment (%zx) < size (%zx)\n",
addr, align, size);
size = align;
}
/* Push MTRR mask then base -- upper 32-bits then lower 32-bits. */
stack_push(pcf, pcf->upper_mask);
stack_push(pcf, ~(size - 1) | MTRR_PHYS_MASK_VALID);
stack_push(pcf, 0);
stack_push(pcf, addr | type);
pcf->num_var_mttrs++;
}
void run_postcar_phase(struct postcar_frame *pcf)
{
struct prog prog =
PROG_INIT(PROG_UNKNOWN, CONFIG_CBFS_PREFIX "/postcar");
struct rmod_stage_load rsl = {
.cbmem_id = CBMEM_ID_AFTER_CAR,
.prog = &prog,
};
/*
* 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_mttrs);
stack_push(pcf, pcf->max_var_mttrs);
if (prog_locate(&prog))
die("Failed to locate after CAR program.\n");
if (rmodule_stage_load(&rsl))
die("Failed to load after CAR program.\n");
/* Set the stack pointer within parameters of the program loaded. */
if (rsl.params == NULL)
die("No parameters found in after CAR program.\n");
*(uintptr_t *)rsl.params = pcf->stack;
prog_run(&prog);
}
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