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Diffstat (limited to 'grub-core/loader/powerpc/ieee1275/linux.c')
-rw-r--r--grub-core/loader/powerpc/ieee1275/linux.c393
1 files changed, 393 insertions, 0 deletions
diff --git a/grub-core/loader/powerpc/ieee1275/linux.c b/grub-core/loader/powerpc/ieee1275/linux.c
new file mode 100644
index 0000000..818b2a8
--- /dev/null
+++ b/grub-core/loader/powerpc/ieee1275/linux.c
@@ -0,0 +1,393 @@
+/* linux.c - boot Linux */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2003,2004,2005,2007,2009 Free Software Foundation, Inc.
+ *
+ * GRUB 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/elf.h>
+#include <grub/elfload.h>
+#include <grub/loader.h>
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/ieee1275/ieee1275.h>
+#include <grub/command.h>
+#include <grub/i18n.h>
+#include <grub/memory.h>
+#include <grub/lib/cmdline.h>
+#include <grub/cache.h>
+#include <grub/linux.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+#define ELF32_LOADMASK (0xc0000000UL)
+#define ELF64_LOADMASK (0xc000000000000000ULL)
+
+static grub_dl_t my_mod;
+
+static int loaded;
+
+static grub_addr_t initrd_addr;
+static grub_size_t initrd_size;
+
+static grub_addr_t linux_addr;
+static grub_addr_t linux_entry;
+static grub_size_t linux_size;
+
+static char *linux_args;
+
+typedef void (*kernel_entry_t) (void *, unsigned long, int (void *),
+ unsigned long, unsigned long);
+
+/* Context for grub_linux_claimmap_iterate. */
+struct grub_linux_claimmap_iterate_ctx
+{
+ grub_addr_t target;
+ grub_size_t size;
+ grub_size_t align;
+ grub_addr_t found_addr;
+};
+
+/* Helper for grub_linux_claimmap_iterate. */
+static int
+alloc_mem (grub_uint64_t addr, grub_uint64_t len, grub_memory_type_t type,
+ void *data)
+{
+ struct grub_linux_claimmap_iterate_ctx *ctx = data;
+
+ grub_uint64_t end = addr + len;
+ addr = ALIGN_UP (addr, ctx->align);
+ ctx->target = ALIGN_UP (ctx->target, ctx->align);
+
+ /* Target above the memory chunk. */
+ if (type != GRUB_MEMORY_AVAILABLE || ctx->target > end)
+ return 0;
+
+ /* Target inside the memory chunk. */
+ if (ctx->target >= addr && ctx->target < end &&
+ ctx->size <= end - ctx->target)
+ {
+ if (grub_claimmap (ctx->target, ctx->size) == GRUB_ERR_NONE)
+ {
+ ctx->found_addr = ctx->target;
+ return 1;
+ }
+ grub_print_error ();
+ }
+ /* Target below the memory chunk. */
+ if (ctx->target < addr && addr + ctx->size <= end)
+ {
+ if (grub_claimmap (addr, ctx->size) == GRUB_ERR_NONE)
+ {
+ ctx->found_addr = addr;
+ return 1;
+ }
+ grub_print_error ();
+ }
+ return 0;
+}
+
+static grub_addr_t
+grub_linux_claimmap_iterate (grub_addr_t target, grub_size_t size,
+ grub_size_t align)
+{
+ struct grub_linux_claimmap_iterate_ctx ctx = {
+ .target = target,
+ .size = size,
+ .align = align,
+ .found_addr = (grub_addr_t) -1
+ };
+
+ if (grub_ieee1275_test_flag (GRUB_IEEE1275_FLAG_FORCE_CLAIM))
+ {
+ grub_uint64_t addr = target;
+ if (addr < GRUB_IEEE1275_STATIC_HEAP_START
+ + GRUB_IEEE1275_STATIC_HEAP_LEN)
+ addr = GRUB_IEEE1275_STATIC_HEAP_START
+ + GRUB_IEEE1275_STATIC_HEAP_LEN;
+ addr = ALIGN_UP (addr, align);
+ if (grub_claimmap (addr, size) == GRUB_ERR_NONE)
+ return addr;
+ return (grub_addr_t) -1;
+ }
+
+
+ grub_machine_mmap_iterate (alloc_mem, &ctx);
+
+ return ctx.found_addr;
+}
+
+static grub_err_t
+grub_linux_boot (void)
+{
+ kernel_entry_t linuxmain;
+ grub_ssize_t actual;
+
+ grub_arch_sync_caches ((void *) linux_addr, linux_size);
+ /* Set the command line arguments. */
+ grub_ieee1275_set_property (grub_ieee1275_chosen, "bootargs", linux_args,
+ grub_strlen (linux_args) + 1, &actual);
+
+ grub_dprintf ("loader", "Entry point: 0x%x\n", linux_entry);
+ grub_dprintf ("loader", "Initrd at: 0x%x, size 0x%x\n", initrd_addr,
+ initrd_size);
+ grub_dprintf ("loader", "Boot arguments: %s\n", linux_args);
+ grub_dprintf ("loader", "Jumping to Linux...\n");
+
+ /* Boot the kernel. */
+ linuxmain = (kernel_entry_t) linux_entry;
+ linuxmain ((void *) initrd_addr, initrd_size, grub_ieee1275_entry_fn, 0, 0);
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_linux_release_mem (void)
+{
+ grub_free (linux_args);
+ linux_args = 0;
+
+ if (linux_addr && grub_ieee1275_release (linux_addr, linux_size))
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory");
+
+ if (initrd_addr && grub_ieee1275_release (initrd_addr, initrd_size))
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot release memory");
+
+ linux_addr = 0;
+ initrd_addr = 0;
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_linux_unload (void)
+{
+ grub_err_t err;
+
+ err = grub_linux_release_mem ();
+ grub_dl_unref (my_mod);
+
+ loaded = 0;
+
+ return err;
+}
+
+static grub_err_t
+grub_linux_load32 (grub_elf_t elf, const char *filename)
+{
+ Elf32_Addr base_addr;
+ grub_addr_t seg_addr;
+ grub_uint32_t align;
+ grub_uint32_t offset;
+ Elf32_Addr entry;
+
+ linux_size = grub_elf32_size (elf, &base_addr, &align);
+ if (linux_size == 0)
+ return grub_errno;
+ /* Pad it; the kernel scribbles over memory beyond its load address. */
+ linux_size += 0x100000;
+
+ /* Linux's entry point incorrectly contains a virtual address. */
+ entry = elf->ehdr.ehdr32.e_entry & ~ELF32_LOADMASK;
+
+ /* Linux's incorrectly contains a virtual address. */
+ base_addr &= ~ELF32_LOADMASK;
+ offset = entry - base_addr;
+
+ /* On some systems, firmware occupies the memory we're trying to use.
+ * Happily, Linux can be loaded anywhere (it relocates itself). Iterate
+ * until we find an open area. */
+ seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF32_LOADMASK, linux_size, align);
+ if (seg_addr == (grub_addr_t) -1)
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory");
+
+ linux_entry = seg_addr + offset;
+ linux_addr = seg_addr;
+
+ /* Now load the segments into the area we claimed. */
+ return grub_elf32_load (elf, filename, (void *) (seg_addr - base_addr), GRUB_ELF_LOAD_FLAGS_30BITS, 0, 0);
+}
+
+static grub_err_t
+grub_linux_load64 (grub_elf_t elf, const char *filename)
+{
+ Elf64_Addr base_addr;
+ grub_addr_t seg_addr;
+ grub_uint64_t align;
+ grub_uint64_t offset;
+ Elf64_Addr entry;
+
+ linux_size = grub_elf64_size (elf, &base_addr, &align);
+ if (linux_size == 0)
+ return grub_errno;
+ /* Pad it; the kernel scribbles over memory beyond its load address. */
+ linux_size += 0x100000;
+
+ base_addr &= ~ELF64_LOADMASK;
+ entry = elf->ehdr.ehdr64.e_entry & ~ELF64_LOADMASK;
+ offset = entry - base_addr;
+ /* Linux's incorrectly contains a virtual address. */
+
+ /* On some systems, firmware occupies the memory we're trying to use.
+ * Happily, Linux can be loaded anywhere (it relocates itself). Iterate
+ * until we find an open area. */
+ seg_addr = grub_linux_claimmap_iterate (base_addr & ~ELF64_LOADMASK, linux_size, align);
+ if (seg_addr == (grub_addr_t) -1)
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY, "couldn't claim memory");
+
+ linux_entry = seg_addr + offset;
+ linux_addr = seg_addr;
+
+ /* Now load the segments into the area we claimed. */
+ return grub_elf64_load (elf, filename, (void *) (grub_addr_t) (seg_addr - base_addr), GRUB_ELF_LOAD_FLAGS_62BITS, 0, 0);
+}
+
+static grub_err_t
+grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+ int argc, char *argv[])
+{
+ grub_elf_t elf = 0;
+ int size;
+
+ grub_dl_ref (my_mod);
+
+ if (argc == 0)
+ {
+ grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+ goto out;
+ }
+
+ elf = grub_elf_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL);
+ if (! elf)
+ goto out;
+
+ if (elf->ehdr.ehdr32.e_type != ET_EXEC && elf->ehdr.ehdr32.e_type != ET_DYN)
+ {
+ grub_error (GRUB_ERR_UNKNOWN_OS,
+ N_("this ELF file is not of the right type"));
+ goto out;
+ }
+
+ /* Release the previously used memory. */
+ grub_loader_unset ();
+
+ if (grub_elf_is_elf32 (elf))
+ grub_linux_load32 (elf, argv[0]);
+ else
+ if (grub_elf_is_elf64 (elf))
+ grub_linux_load64 (elf, argv[0]);
+ else
+ {
+ grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("invalid arch-dependent ELF magic"));
+ goto out;
+ }
+
+ size = grub_loader_cmdline_size(argc, argv);
+ linux_args = grub_malloc (size + sizeof (LINUX_IMAGE));
+ if (! linux_args)
+ goto out;
+
+ /* Create kernel command line. */
+ grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
+ if (grub_create_loader_cmdline (argc, argv, linux_args + sizeof (LINUX_IMAGE) - 1,
+ size, GRUB_VERIFY_KERNEL_CMDLINE))
+ goto out;
+
+out:
+
+ if (elf)
+ grub_elf_close (elf);
+
+ if (grub_errno != GRUB_ERR_NONE)
+ {
+ grub_linux_release_mem ();
+ grub_dl_unref (my_mod);
+ loaded = 0;
+ }
+ else
+ {
+ grub_loader_set (grub_linux_boot, grub_linux_unload, 1);
+ initrd_addr = 0;
+ loaded = 1;
+ }
+
+ return grub_errno;
+}
+
+static grub_err_t
+grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
+ int argc, char *argv[])
+{
+ grub_size_t size = 0;
+ grub_addr_t first_addr;
+ grub_addr_t addr;
+ struct grub_linux_initrd_context initrd_ctx = { 0, 0, 0 };
+
+ if (argc == 0)
+ {
+ grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+ goto fail;
+ }
+
+ if (!loaded)
+ {
+ grub_error (GRUB_ERR_BAD_ARGUMENT, N_("you need to load the kernel first"));
+ goto fail;
+ }
+
+ if (grub_initrd_init (argc, argv, &initrd_ctx))
+ goto fail;
+
+ size = grub_get_initrd_size (&initrd_ctx);
+
+ first_addr = linux_addr + linux_size;
+
+ /* Attempt to claim at a series of addresses until successful in
+ the same way that grub_rescue_cmd_linux does. */
+ addr = grub_linux_claimmap_iterate (first_addr, size, 0x100000);
+ if (addr == (grub_addr_t) -1)
+ goto fail;
+
+ grub_dprintf ("loader", "Loading initrd at 0x%x, size 0x%x\n", addr, size);
+
+ if (grub_initrd_load (&initrd_ctx, argv, (void *) addr))
+ goto fail;
+
+ initrd_addr = addr;
+ initrd_size = size;
+
+ fail:
+ grub_initrd_close (&initrd_ctx);
+
+ return grub_errno;
+}
+
+static grub_command_t cmd_linux, cmd_initrd;
+
+GRUB_MOD_INIT(linux)
+{
+ cmd_linux = grub_register_command ("linux", grub_cmd_linux,
+ 0, N_("Load Linux."));
+ cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
+ 0, N_("Load initrd."));
+ my_mod = mod;
+}
+
+GRUB_MOD_FINI(linux)
+{
+ grub_unregister_command (cmd_linux);
+ grub_unregister_command (cmd_initrd);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-04 23:26:46 +0000