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/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <drivers/vpd/vpd.h>
#include <drivers/ocp/include/vpd.h>
#include <string.h>
#include <program_loading.h>
#define CMDLINE_LOGLVL_STR "loglevel="
static void overwrite_kernel_loglevel(uintptr_t start)
{
int val;
if (!vpd_get_int(KERNEL_LOG_LEVEL, VPD_RW_THEN_RO, &val)) {
printk(BIOS_DEBUG, "%s: not able to get VPD %s\n", __func__, KERNEL_LOG_LEVEL);
return;
}
printk(BIOS_DEBUG, "%s: VPD %s, got %d\n", __func__, KERNEL_LOG_LEVEL, val);
if (val < 0 || val > 7) {
printk(BIOS_INFO, "Invalid VPD for Linux kernel log level\n");
return;
}
int loglevel;
char *loc = strstr((const char *)start, CMDLINE_LOGLVL_STR);
if (!loc) {
printk(BIOS_INFO, "%s is not found from LINUX_COMMAND_LINE\n",
CMDLINE_LOGLVL_STR);
return;
}
char *loc_bkup;
loc += strlen(CMDLINE_LOGLVL_STR);
loc_bkup = loc;
loglevel = skip_atoi(&loc);
printk(BIOS_DEBUG, "Original kernel log level is %d\n", loglevel);
/* Unlikely but don't overwrite with such an unexpected case. */
if (loglevel < 0 || loglevel > 7) {
printk(BIOS_DEBUG, "Invalid kernel log level, must be from 0 to 7.\n");
return;
}
char c = '0' + val;
printk(BIOS_INFO, "Overwrite kernel log level with %c from VPD.\n", c);
memcpy(loc_bkup, &c, 1);
}
void platform_segment_loaded(uintptr_t start, size_t size, int flags)
{
/* CONFIG_LINUX_COMMAND_LINE is in the final segment. */
if (flags != SEG_FINAL)
return;
overwrite_kernel_loglevel(start);
}
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