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authorAaron Durbin <adurbin@chromium.org>2015-05-15 13:15:34 -0500
committerAaron Durbin <adurbin@chromium.org>2015-05-26 22:32:47 +0200
commitc6588c5af94e568bddd8111c3fca736f464042cf (patch)
tree0efa16d6948cfde369932fd18dec46102f807c2f /src/arch/x86
parentdef0fb57dfd91e6599c622a7b2769164a5c02ef0 (diff)
coreboot: introduce boot_device
The boot_device is a region_device that represents the device from which coreboot retrieves and boots its stages. The existing cbfs implementations use the boot_device as the intermediary for accessing the CBFS region. Also, there's currently only support for a read-only view of the boot_device. i.e. one cannot write to the boot_device using this view. However, a writable boot_device could be added in the future. Change-Id: Ic0da796ab161b8025c90631be3423ba6473ad31c Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/10216 Tested-by: build bot (Jenkins) Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src/arch/x86')
-rw-r--r--src/arch/x86/lib/Makefile.inc3
-rw-r--r--src/arch/x86/lib/mmap_boot.c31
-rw-r--r--src/arch/x86/lib/rom_media.c57
3 files changed, 61 insertions, 30 deletions
diff --git a/src/arch/x86/lib/Makefile.inc b/src/arch/x86/lib/Makefile.inc
index c7e8b626a6..e308be91bc 100644
--- a/src/arch/x86/lib/Makefile.inc
+++ b/src/arch/x86/lib/Makefile.inc
@@ -6,6 +6,7 @@ romstage-y += memset.c
romstage-y += memcpy.c
romstage-y += memmove.c
romstage-y += rom_media.c
+romstage-y += mmap_boot.c
endif # CONFIG_ARCH_ROMSTAGE_X86_32
@@ -22,6 +23,7 @@ ramstage-y += memcpy.c
ramstage-y += memmove.c
ramstage-y += ebda.c
ramstage-y += rom_media.c
+ramstage-y += mmap_boot.c
ramstage-$(CONFIG_COOP_MULTITASKING) += thread.c
ramstage-$(CONFIG_COOP_MULTITASKING) += thread_switch.S
ramstage-$(CONFIG_COLLECT_TIMESTAMPS) += timestamp.c
@@ -32,6 +34,7 @@ smm-y += memset.c
smm-y += memcpy.c
smm-y += memmove.c
smm-y += rom_media.c
+smm-y += mmap_boot.c
rmodules_x86_32-y += memset.c
rmodules_x86_32-y += memcpy.c
diff --git a/src/arch/x86/lib/mmap_boot.c b/src/arch/x86/lib/mmap_boot.c
new file mode 100644
index 0000000000..eb7b23e2b1
--- /dev/null
+++ b/src/arch/x86/lib/mmap_boot.c
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#include <boot_device.h>
+
+/* The ROM is memory mapped just below 4GiB. Form a pointer for the base. */
+#define rom_base ((void *)(uintptr_t)(-(int32_t)CONFIG_ROM_SIZE))
+
+static const struct mem_region_device boot_dev =
+ MEM_REGION_DEV_INIT(rom_base, CONFIG_ROM_SIZE);
+
+const struct region_device *boot_device_ro(void)
+{
+ return &boot_dev.rdev;
+}
diff --git a/src/arch/x86/lib/rom_media.c b/src/arch/x86/lib/rom_media.c
index 659e5e4f9b..d4663c7f60 100644
--- a/src/arch/x86/lib/rom_media.c
+++ b/src/arch/x86/lib/rom_media.c
@@ -17,6 +17,8 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
+
+#include <boot_device.h>
#include <cbfs.h>
#include <string.h>
@@ -36,14 +38,19 @@ static int x86_rom_open(struct cbfs_media *media) {
static void *x86_rom_map(struct cbfs_media *media, size_t offset, size_t count) {
void *ptr;
- // Some address (ex, pointer to master header) may be given in memory
- // mapped location. To workaround that, we handle >0xf0000000 as real
- // memory pointer.
+ const struct region_device *boot_dev;
+
+ boot_dev = media->context;
+ /* Extremely large offsets are considered relative to end of region. */
if ((uint32_t)offset > (uint32_t)0xf0000000)
- ptr = (void*)offset;
- else
- ptr = (void*)(0 - (uint32_t)media->context + offset);
+ offset += region_device_sz(boot_dev);
+
+ ptr = rdev_mmap(boot_dev, offset, count);
+
+ if (ptr == NULL)
+ return (void *)-1;
+
return ptr;
}
@@ -53,7 +60,13 @@ static void *x86_rom_unmap(struct cbfs_media *media, const void *address) {
static size_t x86_rom_read(struct cbfs_media *media, void *dest, size_t offset,
size_t count) {
- void *ptr = x86_rom_map(media, offset, count);
+ void *ptr;
+
+ ptr = x86_rom_map(media, offset, count);
+
+ if (ptr == (void *)-1)
+ return 0;
+
memcpy(dest, ptr, count);
x86_rom_unmap(media, ptr);
return count;
@@ -63,30 +76,14 @@ static int x86_rom_close(struct cbfs_media *media) {
return 0;
}
-int init_x86rom_cbfs_media(struct cbfs_media *media);
-int init_x86rom_cbfs_media(struct cbfs_media *media) {
- // On X86, we always keep a reference of pointer to CBFS header in
- // 0xfffffffc, and the pointer is still a memory-mapped address.
- // Since the CBFS core always use ROM offset, we need to figure out
- // header->romsize even before media is initialized.
- struct cbfs_header *header = (struct cbfs_header*)
- *(uint32_t*)(0xfffffffc);
- if (CBFS_HEADER_MAGIC != ntohl(header->magic)) {
-#if defined(CONFIG_ROM_SIZE)
- printk(BIOS_ERR, "Invalid CBFS master header at %p\n", header);
- media->context = (void*)CONFIG_ROM_SIZE;
-#else
+static int init_x86rom_cbfs_media(struct cbfs_media *media) {
+ boot_device_init();
+
+ media->context = (void *)boot_device_ro();
+
+ if (media->context == NULL)
return -1;
-#endif
- } else {
- uint32_t romsize = ntohl(header->romsize);
- media->context = (void*)romsize;
-#if defined(CONFIG_ROM_SIZE)
- if (CONFIG_ROM_SIZE != romsize)
- printk(BIOS_INFO, "Warning: rom size unmatch (%d/%d)\n",
- CONFIG_ROM_SIZE, romsize);
-#endif
- }
+
media->open = x86_rom_open;
media->close = x86_rom_close;
media->map = x86_rom_map;