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mb/emulation/qemu-i440fx: make fw_cfg_present usable in PRERAM 

Change-Id: I98f1c97e3ca33a12620cdd073c76fd4e271f1fcc
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Reviewed-on: https://review.coreboot.org/c/30849
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
This commit is contained in:
Thomas Heijligen 2019-01-10 19:42:21 +01:00 committed by Nico Huber
parent da9aa6ddd7
commit 0065b6974f
1 changed files with 7 additions and 5 deletions
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12
src/mainboard/emulation/qemu-i440fx/fw_cfg.c
View File

@ -25,20 +25,22 @@
#define FW_CFG_PORT_CTL 0x0510
#define FW_CFG_PORT_DATA 0x0511
static unsigned char fw_cfg_detected = 0xff;
static int fw_cfg_detected;
static int fw_cfg_present(void)
{
static const char qsig[] = "QEMU";
unsigned char sig[4];
int detected = 0;
if (fw_cfg_detected == 0xff) {
if (fw_cfg_detected == 0) {
fw_cfg_get(FW_CFG_SIGNATURE, sig, sizeof(sig));
fw_cfg_detected = (memcmp(sig, qsig, 4) == 0) ? 1 : 0;
detected = memcmp(sig, qsig, 4) == 0;
printk(BIOS_INFO, "QEMU: firmware config interface %s\n",
fw_cfg_detected ? "detected" : "not found");
detected ? "detected" : "not found");
fw_cfg_detected = detected + 1;
}
return fw_cfg_detected;
return fw_cfg_detected - 1;
}
static void fw_cfg_select(uint16_t entry)