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[PATCH 2/2] RISC-V: Implement linux image loader
From: |
Chester Lin |
Subject: |
[PATCH 2/2] RISC-V: Implement linux image loader |
Date: |
Thu, 16 Jan 2020 10:21:47 +0000 |
An image loader for booting RISC-V linux. The major idea is based on
loader/arm64/linux.c but still follows the the current boot procedure of
RISC-V Linux. [boot-entry = dram-base + text-offset]
Signed-off-by: Chester Lin <address@hidden>
---
grub-core/loader/riscv/linux.c | 311 ++++++++++++++++++++++++++++++++-
1 file changed, 307 insertions(+), 4 deletions(-)
diff --git a/grub-core/loader/riscv/linux.c b/grub-core/loader/riscv/linux.c
index d17c488e1..e1960356e 100644
--- a/grub-core/loader/riscv/linux.c
+++ b/grub-core/loader/riscv/linux.c
@@ -15,21 +15,240 @@
* 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/charset.h>
#include <grub/command.h>
-#include <grub/dl.h>
+#include <grub/err.h>
+#include <grub/file.h>
+#include <grub/fdt.h>
+#include <grub/linux.h>
+#include <grub/loader.h>
+#include <grub/mm.h>
+#include <grub/types.h>
+#include <grub/cpu/linux.h>
+#include <grub/efi/efi.h>
+#include <grub/efi/fdtload.h>
+#include <grub/efi/memory.h>
+#include <grub/efi/pe32.h>
+#include <grub/i18n.h>
#include <grub/lib/cmdline.h>
+#include <grub/verify.h>
GRUB_MOD_LICENSE ("GPLv3+");
+static grub_dl_t my_mod;
+static int loaded;
+
+static void *kernel_addr;
+static grub_size_t kernel_size;
+
+static char *linux_args;
+static grub_size_t cmdline_size;
+
+static grub_addr_t initrd_start;
+static grub_addr_t initrd_end;
+
+#if __riscv_xlen == 64
+#define INITRD_MAX_ADDRESS_OFFSET (32ULL * 1024 * 1024 * 1024)
+#else
+#define INITRD_MAX_ADDRESS_OFFSET (512U * 1024 * 1024)
+#endif
+
+#define get_hartid(__v) \
+{ \
+ __asm__ __volatile__ ("mv %0, tp" \
+ : "=r" (__v) : \
+ : "memory"); \
+}
+
+typedef void (*kernel_entry_t) (int, void *);
+
+grub_err_t
+grub_arch_efi_linux_check_image (struct linux_arch_kernel_header * lh)
+{
+ if (lh->magic != GRUB_LINUX_RISCV_MAGIC_SIGNATURE)
+ return grub_error(GRUB_ERR_BAD_OS, "invalid magic number");
+
+ grub_dprintf ("linux", "UEFI stub kernel:\n");
+ grub_dprintf ("linux", "PE/COFF header @ %08x\n", lh->hdr_offset);
+
+ return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+prepare_fdt (void **fdt_addr)
+{
+ int node, retval;
+ void *fdt;
+
+ fdt = grub_fdt_load (GRUB_EFI_LINUX_FDT_EXTRA_SPACE);
+
+ if (!fdt)
+ goto failure;
+
+ node = grub_fdt_find_subnode (fdt, 0, "chosen");
+ if (node < 0)
+ node = grub_fdt_add_subnode (fdt, 0, "chosen");
+
+ if (node < 1)
+ goto failure;
+
+ /* Set initrd info */
+ if (initrd_start && initrd_end > initrd_start)
+ {
+ grub_dprintf ("linux", "Initrd @ %p-%p\n",
+ (void *) initrd_start, (void *) initrd_end);
+
+ retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-start",
+ initrd_start);
+ if (retval)
+ goto failure;
+
+ retval = grub_fdt_set_prop64 (fdt, node, "linux,initrd-end",
+ initrd_end);
+ if (retval)
+ goto failure;
+ }
+
+ if (grub_fdt_install() != GRUB_ERR_NONE)
+ goto failure;
+
+ *fdt_addr = fdt;
+
+ return GRUB_ERR_NONE;
+
+failure:
+ grub_fdt_unload();
+ return grub_error(GRUB_ERR_BAD_OS, "failed to install/update FDT");
+}
+
+static grub_err_t
+grub_linux_boot (void)
+{
+ register unsigned long hartid;
+ kernel_entry_t boot_kernel;
+ void *fdt_addr = NULL;
+
+ if(!kernel_addr)
+ return grub_error(GRUB_ERR_BAD_OS, "kernel image is not loaded");
+
+ boot_kernel = (kernel_entry_t) kernel_addr;
+
+ if(prepare_fdt(&fdt_addr) != GRUB_ERR_NONE)
+ goto failure;
+
+ get_hartid(hartid);
+
+ grub_dprintf ("linux", "Boot Hart: %lu\n", hartid);
+
+ boot_kernel(hartid, fdt_addr);
+
+failure:
+ return grub_error(GRUB_ERR_BAD_OS, "failed to boot kernel");
+}
+
+
+
+static grub_err_t
+grub_linux_unload (void)
+{
+ grub_dl_unref (my_mod);
+ loaded = 0;
+ if (initrd_start)
+ grub_efi_free_pages ((grub_efi_physical_address_t) initrd_start,
+ GRUB_EFI_BYTES_TO_PAGES (initrd_end - initrd_start));
+ initrd_start = initrd_end = 0;
+ grub_free (linux_args);
+ if (kernel_addr)
+ grub_efi_free_pages ((grub_addr_t) kernel_addr,
+ GRUB_EFI_BYTES_TO_PAGES (kernel_size));
+ grub_fdt_unload ();
+ return GRUB_ERR_NONE;
+}
+
+/*
+ * This function returns a pointer to a legally allocated initrd buffer,
+ * or NULL if unsuccessful
+ */
+static void *
+allocate_kernel_mem (int kernel_pages, grub_addr_t offset)
+{
+ grub_addr_t max_addr;
+
+ if (grub_efi_get_ram_base (&max_addr) != GRUB_ERR_NONE)
+ return NULL;
+
+ max_addr += offset;
+
+ return grub_efi_allocate_pages_real (max_addr, kernel_pages,
+ GRUB_EFI_ALLOCATE_ADDRESS,
+ GRUB_EFI_LOADER_DATA);
+}
+
+static void *
+allocate_initrd_mem (int initrd_pages)
+{
+ grub_addr_t max_addr;
+
+ if (grub_efi_get_ram_base (&max_addr) != GRUB_ERR_NONE)
+ return NULL;
+
+ max_addr += INITRD_MAX_ADDRESS_OFFSET - 1;
+
+ return grub_efi_allocate_pages_real (max_addr, initrd_pages,
+ GRUB_EFI_ALLOCATE_MAX_ADDRESS,
+ GRUB_EFI_LOADER_DATA);
+}
+
static grub_err_t
grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char *argv[] __attribute__ ((unused)))
{
- grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, N_("Linux not supported yet"));
+ struct grub_linux_initrd_context initrd_ctx = { 0, 0, 0 };
+ int initrd_size, initrd_pages;
+ void *initrd_mem = NULL;
+
+ 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;
+
+ initrd_size = grub_get_initrd_size (&initrd_ctx);
+ grub_dprintf ("linux", "Loading initrd\n");
+
+ initrd_pages = (GRUB_EFI_BYTES_TO_PAGES (initrd_size));
+ initrd_mem = allocate_initrd_mem (initrd_pages);
+
+ if (!initrd_mem)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+ goto fail;
+ }
+
+ if (grub_initrd_load (&initrd_ctx, argv, initrd_mem))
+ goto fail;
+
+ initrd_start = (grub_addr_t) initrd_mem;
+ initrd_end = initrd_start + initrd_size;
+
+ fail:
+ grub_initrd_close (&initrd_ctx);
+ if (initrd_mem && !initrd_start)
+ grub_efi_free_pages ((grub_addr_t) initrd_mem, initrd_pages);
return grub_errno;
+
}
static grub_err_t
@@ -37,9 +256,92 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char *argv[] __attribute__ ((unused)))
{
- grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, N_("Linux not supported yet"));
+ grub_file_t file = 0;
+ struct linux_arch_kernel_header lh;
+ grub_err_t err;
+
+ grub_dl_ref (my_mod);
+
+ if (argc == 0)
+ {
+ grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+ goto fail;
+ }
+
+ file = grub_file_open (argv[0], GRUB_FILE_TYPE_LINUX_KERNEL);
+ if (!file)
+ goto fail;
+
+ kernel_size = grub_file_size (file);
+
+ if (grub_file_read (file, &lh, sizeof (lh)) < (long) sizeof (lh))
+ return grub_errno;
+
+ if (grub_arch_efi_linux_check_image (&lh) != GRUB_ERR_NONE)
+ goto fail;
+
+ grub_loader_unset();
+
+ kernel_addr = allocate_kernel_mem (
+ GRUB_EFI_BYTES_TO_PAGES (kernel_size), lh.text_offset);
+
+ if (!kernel_addr)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+ goto fail;
+ }
+
+ grub_file_seek (file, 0);
+ if (grub_file_read (file, kernel_addr, kernel_size)
+ < (grub_ssize_t) kernel_size)
+ {
+ if (!grub_errno)
+ grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"), argv[0]);
+ goto fail;
+ }
+
+ grub_dprintf ("linux", "kernel @ %p\n", kernel_addr);
+
+ cmdline_size = grub_loader_cmdline_size (argc, argv) + sizeof (LINUX_IMAGE);
+ linux_args = grub_malloc (cmdline_size);
+ if (!linux_args)
+ {
+ grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+ goto fail;
+ }
+ grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
+ err = grub_create_loader_cmdline (argc, argv,
+ linux_args + sizeof (LINUX_IMAGE) - 1,
+ cmdline_size,
+ GRUB_VERIFY_KERNEL_CMDLINE);
+ if (err)
+ goto fail;
+
+ if (grub_errno == GRUB_ERR_NONE)
+ {
+ grub_loader_set (grub_linux_boot, grub_linux_unload, 0);
+ loaded = 1;
+ }
+
+fail:
+ if (file)
+ grub_file_close (file);
+
+ if (grub_errno != GRUB_ERR_NONE)
+ {
+ grub_dl_unref (my_mod);
+ loaded = 0;
+ }
+
+ if (linux_args && !loaded)
+ grub_free (linux_args);
+
+ if (kernel_addr && !loaded)
+ grub_efi_free_pages ((grub_addr_t) kernel_addr,
+ GRUB_EFI_BYTES_TO_PAGES (kernel_size));
return grub_errno;
+
}
static grub_command_t cmd_linux, cmd_initrd;
@@ -50,6 +352,7 @@ GRUB_MOD_INIT (linux)
N_("Load Linux."));
cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, 0,
N_("Load initrd."));
+ my_mod = mod;
}
GRUB_MOD_FINI (linux)
--
2.24.0
[PATCH 2/2] RISC-V: Implement linux image loader,
Chester Lin <=
[PATCH 1/2] RISC-V: Correct linux headers' definitions, Chester Lin, 2020/01/16