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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Vladimir Serbinenko <phcoder@gmail.com>
Date: Mon, 8 May 2017 22:00:06 +0200
Subject: [PATCH] arm_coreboot: Support loading linux images.
---
grub-core/loader/arm/linux.c | 132 ++++++++++++++++++++++---------------------
include/grub/arm/linux.h | 16 ++++++
2 files changed, 83 insertions(+), 65 deletions(-)
diff --git a/grub-core/loader/arm/linux.c b/grub-core/loader/arm/linux.c
index 01374ee78fa..260cbf06861 100644
--- a/grub-core/loader/arm/linux.c
+++ b/grub-core/loader/arm/linux.c
@@ -31,8 +31,6 @@
GRUB_MOD_LICENSE ("GPLv3+");
-#ifndef GRUB_MACHINE_COREBOOT
-
static grub_dl_t my_mod;
static grub_addr_t initrd_start;
@@ -44,7 +42,7 @@ static grub_size_t linux_size;
static char *linux_args;
static grub_uint32_t machine_type;
-static void *fdt_addr;
+static const void *current_fdt;
typedef void (*kernel_entry_t) (int, unsigned long, void *);
@@ -56,9 +54,9 @@ typedef void (*kernel_entry_t) (int, unsigned long, void *);
#define LINUX_FDT_PHYS_OFFSET (LINUX_INITRD_PHYS_OFFSET - 0x10000)
static grub_size_t
-get_atag_size (grub_uint32_t *atag)
+get_atag_size (const grub_uint32_t *atag)
{
- grub_uint32_t *atag0 = atag;
+ const grub_uint32_t *atag0 = atag;
while (atag[0] && atag[1])
atag += atag[0];
return atag - atag0;
@@ -70,10 +68,11 @@ get_atag_size (grub_uint32_t *atag)
* Merges in command line parameters and sets up initrd addresses.
*/
static grub_err_t
-linux_prepare_atag (void)
+linux_prepare_atag (void *target_atag)
{
- grub_uint32_t *atag_orig = (grub_uint32_t *) fdt_addr;
- grub_uint32_t *tmp_atag, *from, *to;
+ const grub_uint32_t *atag_orig = (const grub_uint32_t *) current_fdt;
+ grub_uint32_t *tmp_atag, *to;
+ const grub_uint32_t *from;
grub_size_t tmp_size;
grub_size_t arg_size = grub_strlen (linux_args);
char *cmdline_orig = NULL;
@@ -144,7 +143,7 @@ linux_prepare_atag (void)
to += 2;
/* Copy updated FDT to its launch location */
- grub_memcpy (atag_orig, tmp_atag, sizeof (grub_uint32_t) * (to - tmp_atag));
+ grub_memcpy (target_atag, tmp_atag, sizeof (grub_uint32_t) * (to - tmp_atag));
grub_free (tmp_atag);
grub_dprintf ("loader", "ATAG updated for Linux boot\n");
@@ -158,19 +157,19 @@ linux_prepare_atag (void)
* Merges in command line parameters and sets up initrd addresses.
*/
static grub_err_t
-linux_prepare_fdt (void)
+linux_prepare_fdt (void *target_fdt)
{
int node;
int retval;
int tmp_size;
void *tmp_fdt;
- tmp_size = grub_fdt_get_totalsize (fdt_addr) + 0x100 + grub_strlen (linux_args);
+ tmp_size = grub_fdt_get_totalsize (current_fdt) + 0x100 + grub_strlen (linux_args);
tmp_fdt = grub_malloc (tmp_size);
if (!tmp_fdt)
return grub_errno;
- grub_memcpy (tmp_fdt, fdt_addr, grub_fdt_get_totalsize (fdt_addr));
+ grub_memcpy (tmp_fdt, current_fdt, grub_fdt_get_totalsize (current_fdt));
grub_fdt_set_totalsize (tmp_fdt, tmp_size);
/* Find or create '/chosen' node */
@@ -211,7 +210,7 @@ linux_prepare_fdt (void)
}
/* Copy updated FDT to its launch location */
- grub_memcpy (fdt_addr, tmp_fdt, tmp_size);
+ grub_memcpy (target_fdt, tmp_fdt, tmp_size);
grub_free (tmp_fdt);
grub_dprintf ("loader", "FDT updated for Linux boot\n");
@@ -228,16 +227,17 @@ linux_boot (void)
{
kernel_entry_t linuxmain;
int fdt_valid, atag_valid;
+ void *target_fdt = 0;
- fdt_valid = (fdt_addr && grub_fdt_check_header_nosize (fdt_addr) == 0);
- atag_valid = ((((grub_uint16_t *) fdt_addr)[3] & ~3) == 0x5440
- && *((grub_uint32_t *) fdt_addr));
+ fdt_valid = (current_fdt && grub_fdt_check_header_nosize (current_fdt) == 0);
+ atag_valid = ((((const grub_uint16_t *) current_fdt)[3] & ~3) == 0x5440
+ && *((const grub_uint32_t *) current_fdt));
grub_dprintf ("loader", "atag: %p, %x, %x, %s, %s\n",
- fdt_addr,
- ((grub_uint16_t *) fdt_addr)[3],
- *((grub_uint32_t *) fdt_addr),
- (char *) fdt_addr,
- (char *) fdt_addr + 1);
+ current_fdt,
+ ((const grub_uint16_t *) current_fdt)[3],
+ *((const grub_uint32_t *) current_fdt),
+ (const char *) current_fdt,
+ (const char *) current_fdt + 1);
if (!fdt_valid && machine_type == GRUB_ARM_MACHINE_TYPE_FDT)
return grub_error (GRUB_ERR_FILE_NOT_FOUND,
@@ -247,23 +247,40 @@ linux_boot (void)
grub_dprintf ("loader", "Kernel at: 0x%x\n", linux_addr);
+ if (fdt_valid || atag_valid)
+ {
+#ifdef GRUB_MACHINE_EFI
+ grub_size_t size;
+ if (fdt_valid)
+ size = grub_fdt_get_totalsize (fdt_addr);
+ else
+ size = 4 * get_atag_size (atag_orig);
+ size += grub_strlen (linux_args) + 256;
+ target_fdt = grub_efi_allocate_loader_memory (LINUX_FDT_PHYS_OFFSET, size);
+ if (!fdt_addr)
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+#else
+ target_fdt = (void *) LINUX_FDT_ADDRESS;
+#endif
+ }
+
if (fdt_valid)
{
grub_err_t err;
- err = linux_prepare_fdt ();
+ err = linux_prepare_fdt (target_fdt);
if (err)
return err;
- grub_dprintf ("loader", "FDT @ 0x%p\n", fdt_addr);
+ grub_dprintf ("loader", "FDT @ %p\n", target_fdt);
}
else if (atag_valid)
{
grub_err_t err;
- err = linux_prepare_atag ();
+ err = linux_prepare_atag (target_fdt);
if (err)
return err;
- grub_dprintf ("loader", "ATAG @ 0x%p\n", fdt_addr);
+ grub_dprintf ("loader", "ATAG @ %p\n", target_fdt);
}
grub_dprintf ("loader", "Jumping to Linux...\n");
@@ -287,7 +304,7 @@ linux_boot (void)
grub_arm_disable_caches_mmu ();
- linuxmain (0, machine_type, fdt_addr);
+ linuxmain (0, machine_type, target_fdt);
return grub_error (GRUB_ERR_BAD_OS, "Linux call returned");
}
@@ -446,11 +463,26 @@ fail:
static grub_err_t
load_dtb (grub_file_t dtb, int size)
{
- if ((grub_file_read (dtb, fdt_addr, size) != size)
- || (grub_fdt_check_header (fdt_addr, size) != 0))
- return grub_error (GRUB_ERR_BAD_OS, N_("invalid device tree"));
+ void *new_fdt = grub_zalloc (size);
+ if (!new_fdt)
+ return grub_errno;
+ grub_dprintf ("loader", "Loading device tree to %p\n",
+ new_fdt);
+ if ((grub_file_read (dtb, new_fdt, size) != size)
+ || (grub_fdt_check_header (new_fdt, size) != 0))
+ {
+ grub_free (new_fdt);
+ return grub_error (GRUB_ERR_BAD_OS, N_("invalid device tree"));
+ }
+
+ grub_fdt_set_totalsize (new_fdt, size);
+ current_fdt = new_fdt;
+ /*
+ * We've successfully loaded an FDT, so any machine type passed
+ * from firmware is now obsolete.
+ */
+ machine_type = GRUB_ARM_MACHINE_TYPE_FDT;
- grub_fdt_set_totalsize (fdt_addr, size);
return GRUB_ERR_NONE;
}
@@ -466,42 +498,13 @@ grub_cmd_devicetree (grub_command_t cmd __attribute__ ((unused)),
dtb = grub_file_open (argv[0]);
if (!dtb)
- goto out;
+ return grub_errno;
size = grub_file_size (dtb);
if (size == 0)
- {
- grub_error (GRUB_ERR_BAD_OS, "empty file");
- goto out;
- }
-
-#ifdef GRUB_MACHINE_EFI
- fdt_addr = grub_efi_allocate_loader_memory (LINUX_FDT_PHYS_OFFSET, size);
- if (!fdt_addr)
- {
- grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
- goto out;
- }
-#else
- fdt_addr = (void *) LINUX_FDT_ADDRESS;
-#endif
-
- grub_dprintf ("loader", "Loading device tree to 0x%08x\n",
- (grub_addr_t) fdt_addr);
- load_dtb (dtb, size);
- if (grub_errno != GRUB_ERR_NONE)
- {
- fdt_addr = NULL;
- goto out;
- }
-
- /*
- * We've successfully loaded an FDT, so any machine type passed
- * from firmware is now obsolete.
- */
- machine_type = GRUB_ARM_MACHINE_TYPE_FDT;
-
- out:
+ grub_error (GRUB_ERR_BAD_OS, "empty file");
+ else
+ load_dtb (dtb, size);
grub_file_close (dtb);
return grub_errno;
@@ -519,7 +522,7 @@ GRUB_MOD_INIT (linux)
/* TRANSLATORS: DTB stands for device tree blob. */
0, N_("Load DTB file."));
my_mod = mod;
- fdt_addr = (void *) grub_arm_firmware_get_boot_data ();
+ current_fdt = grub_arm_firmware_get_boot_data ();
machine_type = grub_arm_firmware_get_machine_type ();
}
@@ -529,4 +532,3 @@ GRUB_MOD_FINI (linux)
grub_unregister_command (cmd_initrd);
grub_unregister_command (cmd_devicetree);
}
-#endif
diff --git a/include/grub/arm/linux.h b/include/grub/arm/linux.h
index a66caad13db..f217f8281ad 100644
--- a/include/grub/arm/linux.h
+++ b/include/grub/arm/linux.h
@@ -46,6 +46,22 @@ grub_arm_firmware_get_machine_type (void)
{
return GRUB_ARM_MACHINE_TYPE_FDT;
}
+#elif defined (GRUB_MACHINE_COREBOOT)
+#include <grub/fdtbus.h>
+#include <grub/machine/kernel.h>
+# define LINUX_ADDRESS (start_of_ram + 0x8000)
+# define LINUX_INITRD_ADDRESS (start_of_ram + 0x02000000)
+# define LINUX_FDT_ADDRESS (LINUX_INITRD_ADDRESS - 0x10000)
+static inline const void *
+grub_arm_firmware_get_boot_data (void)
+{
+ return grub_fdtbus_get_fdt ();
+}
+static inline grub_uint32_t
+grub_arm_firmware_get_machine_type (void)
+{
+ return GRUB_ARM_MACHINE_TYPE_FDT;
+}
#endif
#define FDT_ADDITIONAL_ENTRIES_SIZE 0x300
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