commit 289b45fdffa42db85fa4ad63338677ab8f15e9a2
author Gerd Hoffmann <kraxel@redhat.com> Wed Jun 12 10:18:58 2013 +0200
committer Gerd Hoffmann <kraxel@redhat.com> Mon Nov 11 11:56:37 2013 +0100
tree e59923e1d2526a9685d15d4c01abbce142d41915
parent a91daa5ba15260fc5551ff54fb926d6e2b093711

qemu: add fw_cfg files support

Qemu can provide files using the firmware config interface.
This is used to pass config options, virtual machine config
info and option roms into the guest.

This patch adds support for reading the file index and loading
files from qemu.

Change-Id: I57d4a734527c4117239f355121cf1fb8a390ab0d
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-on: http://review.coreboot.org/4029
Tested-by: build bot (Jenkins)

src/mainboard/emulation/qemu-i440fx/fw_cfg.c

diff --git a/src/mainboard/emulation/qemu-i440fx/fw_cfg.c b/src/mainboard/emulation/qemu-i440fx/fw_cfg.c
index 5166f83..b85a163 100644
--- a/src/mainboard/emulation/qemu-i440fx/fw_cfg.c
+++ b/src/mainboard/emulation/qemu-i440fx/fw_cfg.c
@@ -16,6 +16,7 @@
  */
 
 #include <string.h>
+#include <swab.h>
 #include <console/console.h>
 #include <arch/io.h>
 
@@ -26,6 +27,7 @@
 #define FW_CFG_PORT_DATA      0x0511
 
 static unsigned char fw_cfg_detected = 0xff;
+static FWCfgFiles *fw_files;
 
 static int fw_cfg_present(void)
 {
@@ -47,6 +49,63 @@
 	insb(FW_CFG_PORT_DATA, dst, dstlen);
 }
 
+static void fw_cfg_init_file(void)
+{
+	u32 i, size, count = 0;
+
+	if (fw_files != NULL)
+		return;
+
+	fw_cfg_get(FW_CFG_FILE_DIR, &count, sizeof(count));
+	count = swab32(count);
+	size = count * sizeof(FWCfgFile) + sizeof(count);
+	printk(BIOS_DEBUG, "QEMU: %d files in fw_cfg\n", count);
+	fw_files = malloc(size);
+	fw_cfg_get(FW_CFG_FILE_DIR, fw_files, size);
+	fw_files->count = swab32(fw_files->count);
+	for (i = 0; i < count; i++) {
+		fw_files->f[i].size   = swab32(fw_files->f[i].size);
+		fw_files->f[i].select = swab16(fw_files->f[i].select);
+		printk(BIOS_DEBUG, "QEMU:     %s [size=%d]\n",
+		       fw_files->f[i].name, fw_files->f[i].size);
+	}
+}
+
+static FWCfgFile *fw_cfg_find_file(const char *name)
+{
+	int i;
+
+	fw_cfg_init_file();
+	for (i = 0; i < fw_files->count; i++)
+		if (strcmp(fw_files->f[i].name, name) == 0)
+			return fw_files->f + i;
+	return NULL;
+}
+
+int fw_cfg_check_file(const char *name)
+{
+	FWCfgFile *file;
+
+	if (!fw_cfg_present())
+		return -1;
+	file = fw_cfg_find_file(name);
+	if (!file)
+		return -1;
+	return file->size;
+}
+
+void fw_cfg_load_file(const char *name, void *dst)
+{
+	FWCfgFile *file;
+
+	if (!fw_cfg_present())
+		return;
+	file = fw_cfg_find_file(name);
+	if (!file)
+		return;
+	fw_cfg_get(file->select, dst, file->size);
+}
+
 int fw_cfg_max_cpus(void)
 {
 	unsigned short max_cpus;

src/mainboard/emulation/qemu-i440fx/fw_cfg.h

diff --git a/src/mainboard/emulation/qemu-i440fx/fw_cfg.h b/src/mainboard/emulation/qemu-i440fx/fw_cfg.h
index 063e48f..2a10d8b 100644
--- a/src/mainboard/emulation/qemu-i440fx/fw_cfg.h
+++ b/src/mainboard/emulation/qemu-i440fx/fw_cfg.h
@@ -16,4 +16,6 @@
  */
 
 void fw_cfg_get(int entry, void *dst, int dstlen);
+int fw_cfg_check_file(const char *name);
+void fw_cfg_load_file(const char *name, void *dst);
 int fw_cfg_max_cpus(void);