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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi_gnvs.h>
#include <acpi/acpigen.h>
#include <cbmem.h>
#include <console/console.h>
#include <string.h>
#include <types.h>
#include <vendorcode/google/chromeos/gnvs.h>
static void *gnvs;
void *acpi_get_gnvs(void)
{
if (gnvs)
return gnvs;
gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
if (gnvs)
return gnvs;
printk(BIOS_ERR, "Unable to locate Global NVS\n");
return NULL;
}
static void gnvs_assign_cbmc(void)
{
uint32_t *gnvs_cbmc = gnvs_cbmc_ptr(gnvs);
if (gnvs_cbmc)
*gnvs_cbmc = (uintptr_t)cbmem_find(CBMEM_ID_CONSOLE);
}
/* Needs implementation in platform code. */
__weak uint32_t *gnvs_cbmc_ptr(struct global_nvs *gnvs_)
{
return NULL;
}
__weak void soc_fill_gnvs(struct global_nvs *gnvs_) { }
__weak void mainboard_fill_gnvs(struct global_nvs *gnvs_) { }
void *gnvs_get_or_create(void)
{
size_t gnvs_size;
if (gnvs)
return gnvs;
gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
if (gnvs)
return gnvs;
gnvs_size = gnvs_size_of_array();
if (!gnvs_size)
return NULL;
/* Match with OpRegion declared in global_nvs.asl. */
if (gnvs_size < 0x100)
gnvs_size = 0x100;
if (gnvs_size > 0x1000)
gnvs_size = 0x2000;
else if (CONFIG(MAINBOARD_HAS_CHROMEOS))
gnvs_size = 0x1000;
gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, gnvs_size);
if (!gnvs)
return NULL;
memset(gnvs, 0, gnvs_size);
if (CONFIG(CONSOLE_CBMEM))
gnvs_assign_cbmc();
if (CONFIG(CHROMEOS))
gnvs_assign_chromeos((u8 *)gnvs + GNVS_CHROMEOS_ACPI_OFFSET);
return gnvs;
}
void acpi_fill_gnvs(void)
{
if (!gnvs)
return;
soc_fill_gnvs(gnvs);
mainboard_fill_gnvs(gnvs);
acpigen_write_scope("\\");
acpigen_write_name_dword("NVSA", (uintptr_t)gnvs);
acpigen_pop_len();
}
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