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Diffstat (limited to 'grub-core/loader/sparc64/ieee1275/linux.c')
-rw-r--r--grub-core/loader/sparc64/ieee1275/linux.c521
1 files changed, 521 insertions, 0 deletions
diff --git a/grub-core/loader/sparc64/ieee1275/linux.c b/grub-core/loader/sparc64/ieee1275/linux.c
new file mode 100644
index 0000000..bb47ee0
--- /dev/null
+++ b/grub-core/loader/sparc64/ieee1275/linux.c
@@ -0,0 +1,521 @@
+/* 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/linux.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_dl_t my_mod;
+
+static int loaded;
+
+/* /virtual-memory/translations property layout */
+struct grub_ieee1275_translation {
+ grub_uint64_t vaddr;
+ grub_uint64_t size;
+ grub_uint64_t data;
+};
+
+static struct grub_ieee1275_translation *of_trans;
+static int of_num_trans;
+
+static grub_addr_t phys_base;
+static grub_addr_t grub_phys_start;
+static grub_addr_t grub_phys_end;
+
+static grub_addr_t initrd_addr;
+static grub_addr_t initrd_paddr;
+static grub_size_t initrd_size;
+
+static Elf64_Addr linux_entry;
+static grub_addr_t linux_addr;
+static grub_addr_t linux_paddr;
+static grub_size_t linux_size;
+
+static char *linux_args;
+
+struct linux_bootstr_info {
+ int len, valid;
+ char buf[];
+};
+
+struct linux_hdrs {
+ /* All HdrS versions support these fields. */
+ unsigned int start_insns[2];
+ char magic[4]; /* "HdrS" */
+ unsigned int linux_kernel_version; /* LINUX_VERSION_CODE */
+ unsigned short hdrs_version;
+ unsigned short root_flags;
+ unsigned short root_dev;
+ unsigned short ram_flags;
+ unsigned int __deprecated_ramdisk_image;
+ unsigned int ramdisk_size;
+
+ /* HdrS versions 0x0201 and higher only */
+ char *reboot_command;
+
+ /* HdrS versions 0x0202 and higher only */
+ struct linux_bootstr_info *bootstr_info;
+
+ /* HdrS versions 0x0301 and higher only */
+ unsigned long ramdisk_image;
+};
+
+static grub_err_t
+grub_linux_boot (void)
+{
+ struct linux_bootstr_info *bp;
+ struct linux_hdrs *hp;
+ grub_addr_t addr;
+
+ hp = (struct linux_hdrs *) linux_addr;
+
+ /* Any pointer we dereference in the kernel image must be relocated
+ to where we actually loaded the kernel. */
+ addr = (grub_addr_t) hp->bootstr_info;
+ addr += (linux_addr - linux_entry);
+ bp = (struct linux_bootstr_info *) addr;
+
+ /* Set the command line arguments, unless the kernel has been
+ built with a fixed CONFIG_CMDLINE. */
+ if (!bp->valid)
+ {
+ int len = grub_strlen (linux_args) + 1;
+ if (bp->len < len)
+ len = bp->len;
+ grub_memcpy(bp->buf, linux_args, len);
+ bp->buf[len-1] = '\0';
+ bp->valid = 1;
+ }
+
+ if (initrd_addr)
+ {
+ /* The kernel expects the physical address, adjusted relative
+ to the lowest address advertised in "/memory"'s available
+ property.
+
+ The history of this is that back when the kernel only supported
+ specifying a 32-bit ramdisk address, this was the way to still
+ be able to specify the ramdisk physical address even if memory
+ started at some place above 4GB.
+
+ The magic 0x400000 is KERNBASE, I have no idea why SILO adds
+ that term into the address, but it does and thus we have to do
+ it too as this is what the kernel expects. */
+ hp->ramdisk_image = initrd_paddr - phys_base + 0x400000;
+ hp->ramdisk_size = initrd_size;
+ }
+
+ grub_dprintf ("loader", "Entry point: 0x%lx\n", linux_addr);
+ grub_dprintf ("loader", "Initrd at: 0x%lx, size 0x%lx\n", initrd_addr,
+ initrd_size);
+ grub_dprintf ("loader", "Boot arguments: %s\n", linux_args);
+ grub_dprintf ("loader", "Jumping to Linux...\n");
+
+ /* Boot the kernel. */
+ asm volatile ("ldx %0, %%o4\n"
+ "ldx %1, %%o6\n"
+ "ldx %2, %%o5\n"
+ "mov %%g0, %%o0\n"
+ "mov %%g0, %%o2\n"
+ "mov %%g0, %%o3\n"
+ "jmp %%o5\n"
+ "mov %%g0, %%o1\n": :
+ "m"(grub_ieee1275_entry_fn),
+ "m"(grub_ieee1275_original_stack),
+ "m"(linux_addr));
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_linux_release_mem (void)
+{
+ grub_free (linux_args);
+ linux_args = 0;
+ 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;
+}
+
+#define FOUR_MB (4 * 1024 * 1024)
+
+/* Context for alloc_phys. */
+struct alloc_phys_ctx
+{
+ grub_addr_t size;
+ grub_addr_t ret;
+};
+
+/* Helper for alloc_phys. */
+static int
+alloc_phys_choose (grub_uint64_t addr, grub_uint64_t len,
+ grub_memory_type_t type, void *data)
+{
+ struct alloc_phys_ctx *ctx = data;
+ grub_addr_t end = addr + len;
+
+ if (type != GRUB_MEMORY_AVAILABLE)
+ return 0;
+
+ addr = ALIGN_UP (addr, FOUR_MB);
+ if (addr + ctx->size >= end)
+ return 0;
+
+ /* OBP available region contains grub. Start at grub_phys_end. */
+ /* grub_phys_start does not start at the beginning of the memory region */
+ if ((grub_phys_start >= addr && grub_phys_end < end) ||
+ (addr > grub_phys_start && addr < grub_phys_end))
+ {
+ addr = ALIGN_UP (grub_phys_end, FOUR_MB);
+ if (addr + ctx->size >= end)
+ return 0;
+ }
+
+ grub_dprintf("loader",
+ "addr = 0x%lx grub_phys_start = 0x%lx grub_phys_end = 0x%lx\n",
+ addr, grub_phys_start, grub_phys_end);
+
+ if (loaded)
+ {
+ grub_addr_t linux_end = ALIGN_UP (linux_paddr + linux_size, FOUR_MB);
+
+ if (addr >= linux_paddr && addr < linux_end)
+ {
+ addr = linux_end;
+ if (addr + ctx->size >= end)
+ return 0;
+ }
+ if ((addr + ctx->size) >= linux_paddr
+ && (addr + ctx->size) < linux_end)
+ {
+ addr = linux_end;
+ if (addr + ctx->size >= end)
+ return 0;
+ }
+ }
+
+ ctx->ret = addr;
+ return 1;
+}
+
+static grub_addr_t
+alloc_phys (grub_addr_t size)
+{
+ struct alloc_phys_ctx ctx = {
+ .size = size,
+ .ret = (grub_addr_t) -1
+ };
+
+ grub_machine_mmap_iterate (alloc_phys_choose, &ctx);
+
+ return ctx.ret;
+}
+
+static grub_err_t
+grub_linux_load64 (grub_elf_t elf, const char *filename)
+{
+ grub_addr_t off, paddr, base;
+ int ret;
+
+ linux_entry = elf->ehdr.ehdr64.e_entry;
+ linux_addr = 0x40004000;
+ off = 0x4000;
+ linux_size = grub_elf64_size (elf, 0, 0);
+ if (linux_size == 0)
+ return grub_errno;
+
+ grub_dprintf ("loader", "Attempting to claim at 0x%lx, size 0x%lx.\n",
+ linux_addr, linux_size);
+
+ paddr = alloc_phys (linux_size + off);
+ if (paddr == (grub_addr_t) -1)
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "couldn't allocate physical memory");
+ ret = grub_ieee1275_map (paddr, linux_addr - off,
+ linux_size + off, IEEE1275_MAP_DEFAULT);
+ if (ret)
+ return grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "couldn't map physical memory");
+
+ grub_dprintf ("loader", "Loading Linux at vaddr 0x%lx, paddr 0x%lx, size 0x%lx\n",
+ linux_addr, paddr, linux_size);
+
+ linux_paddr = paddr;
+
+ base = linux_entry - off;
+
+ /* Now load the segments into the area we claimed. */
+ return grub_elf64_load (elf, filename, (void *) (linux_addr - off - base), GRUB_ELF_LOAD_FLAGS_NONE, 0, 0);
+}
+
+static grub_err_t
+grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+ int argc, char *argv[])
+{
+ grub_file_t file = 0;
+ 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;
+ }
+
+ file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL);
+ if (!file)
+ goto out;
+
+ elf = grub_elf_file (file, argv[0]);
+ if (! elf)
+ goto out;
+
+ if (elf->ehdr.ehdr32.e_type != ET_EXEC)
+ {
+ 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_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);
+ else if (file)
+ grub_file_close (file);
+
+ 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 paddr;
+ grub_addr_t addr;
+ int ret;
+ 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);
+
+ addr = 0x60000000;
+
+ paddr = alloc_phys (size);
+ if (paddr == (grub_addr_t) -1)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "couldn't allocate physical memory");
+ goto fail;
+ }
+ ret = grub_ieee1275_map (paddr, addr, size, IEEE1275_MAP_DEFAULT);
+ if (ret)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY,
+ "couldn't map physical memory");
+ goto fail;
+ }
+
+ grub_dprintf ("loader", "Loading initrd at vaddr 0x%lx, paddr 0x%lx, size 0x%lx\n",
+ addr, paddr, size);
+
+ if (grub_initrd_load (&initrd_ctx, argv, (void *) addr))
+ goto fail;
+
+ initrd_addr = addr;
+ initrd_paddr = paddr;
+ initrd_size = size;
+
+ fail:
+ grub_initrd_close (&initrd_ctx);
+
+ return grub_errno;
+}
+
+/* Helper for determine_phys_base. */
+static int
+get_physbase (grub_uint64_t addr, grub_uint64_t len __attribute__ ((unused)),
+ grub_memory_type_t type, void *data __attribute__ ((unused)))
+{
+ if (type != GRUB_MEMORY_AVAILABLE)
+ return 0;
+ if (addr < phys_base)
+ phys_base = addr;
+ return 0;
+}
+
+static void
+determine_phys_base (void)
+{
+ phys_base = ~(grub_uint64_t) 0;
+ grub_machine_mmap_iterate (get_physbase, NULL);
+}
+
+static void
+fetch_translations (void)
+{
+ grub_ieee1275_phandle_t node;
+ grub_ssize_t actual;
+ int i;
+
+ if (grub_ieee1275_finddevice ("/virtual-memory", &node))
+ {
+ grub_printf ("Cannot find /virtual-memory node.\n");
+ return;
+ }
+
+ if (grub_ieee1275_get_property_length (node, "translations", &actual))
+ {
+ grub_printf ("Cannot find /virtual-memory/translations size.\n");
+ return;
+ }
+
+ of_trans = grub_malloc (actual);
+ if (!of_trans)
+ {
+ grub_printf ("Cannot allocate translations buffer.\n");
+ return;
+ }
+
+ if (grub_ieee1275_get_property (node, "translations", of_trans, actual, &actual))
+ {
+ grub_printf ("Cannot fetch /virtual-memory/translations property.\n");
+ return;
+ }
+
+ of_num_trans = actual / sizeof(struct grub_ieee1275_translation);
+
+ for (i = 0; i < of_num_trans; i++)
+ {
+ struct grub_ieee1275_translation *p = &of_trans[i];
+
+ if (p->vaddr == 0x2000)
+ {
+ grub_addr_t phys, tte = p->data;
+
+ phys = tte & ~(0xff00000000001fffULL);
+
+ grub_phys_start = phys;
+ grub_phys_end = grub_phys_start + p->size;
+ grub_dprintf ("loader", "Grub lives at phys_start[%lx] phys_end[%lx]\n",
+ (unsigned long) grub_phys_start,
+ (unsigned long) grub_phys_end);
+ break;
+ }
+ }
+}
+
+
+static grub_command_t cmd_linux, cmd_initrd;
+
+GRUB_MOD_INIT(linux)
+{
+ determine_phys_base ();
+ fetch_translations ();
+
+ 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 2024-05-05 06:52:06 +0000