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[PATCH 6/9] RISC-V: Add Linux load logic


From: Alexander Graf
Subject: [PATCH 6/9] RISC-V: Add Linux load logic
Date: Tue, 6 Nov 2018 18:58:34 +0100

We currently only support to run grub on RISC-V as UEFI payload. Ideally,
we also only want to support running Linux underneath as UEFI payload.

Prepare that with a Linux boot case that is not enabled in Linux yet. At
least it will give people something to test against when they enable the
Linux UEFI port.

Signed-off-by: Alexander Graf <address@hidden>
---
 grub-core/loader/riscv/linux.c | 351 +++++++++++++++++++++++++++++++++++++++++
 include/grub/riscv32/linux.h   |  41 +++++
 include/grub/riscv64/linux.h   |  43 +++++
 3 files changed, 435 insertions(+)
 create mode 100644 grub-core/loader/riscv/linux.c
 create mode 100644 include/grub/riscv32/linux.h
 create mode 100644 include/grub/riscv64/linux.h

diff --git a/grub-core/loader/riscv/linux.c b/grub-core/loader/riscv/linux.c
new file mode 100644
index 000000000..229f299b5
--- /dev/null
+++ b/grub-core/loader/riscv/linux.c
@@ -0,0 +1,351 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  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/charset.h>
+#include <grub/command.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>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_dl_t my_mod;
+static int loaded;
+
+static void *kernel_addr;
+static grub_uint64_t kernel_size;
+
+static char *linux_args;
+static grub_uint32_t cmdline_size;
+
+static grub_addr_t initrd_start;
+static grub_addr_t initrd_end;
+
+grub_err_t
+grub_arch_efi_linux_check_image (struct linux_riscv_kernel_header * lh)
+{
+  if (lh->magic != GRUB_LINUX_RISCV_MAGIC_SIGNATURE)
+    return grub_error(GRUB_ERR_BAD_OS, "invalid magic number");
+
+  if ((lh->code0 & 0xffff) != GRUB_PE32_MAGIC)
+    return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
+                      N_("plain image kernel not supported - rebuild with 
CONFIG_(U)EFI_STUB enabled"));
+
+  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
+finalize_params_linux (void)
+{
+  int node, retval;
+
+  void *fdt;
+
+  fdt = grub_fdt_load (0x400);
+
+  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;
+
+  return GRUB_ERR_NONE;
+
+failure:
+  grub_fdt_unload();
+  return grub_error(GRUB_ERR_BAD_OS, "failed to install/update FDT");
+}
+
+grub_err_t
+grub_arch_efi_linux_boot_image (grub_addr_t addr, grub_size_t size, char *args)
+{
+  grub_efi_memory_mapped_device_path_t *mempath;
+  grub_efi_handle_t image_handle;
+  grub_efi_boot_services_t *b;
+  grub_efi_status_t status;
+  grub_efi_loaded_image_t *loaded_image;
+  int len;
+
+  mempath = grub_malloc (2 * sizeof (grub_efi_memory_mapped_device_path_t));
+  if (!mempath)
+    return grub_errno;
+
+  mempath[0].header.type = GRUB_EFI_HARDWARE_DEVICE_PATH_TYPE;
+  mempath[0].header.subtype = GRUB_EFI_MEMORY_MAPPED_DEVICE_PATH_SUBTYPE;
+  mempath[0].header.length = grub_cpu_to_le16_compile_time (sizeof (*mempath));
+  mempath[0].memory_type = GRUB_EFI_LOADER_DATA;
+  mempath[0].start_address = addr;
+  mempath[0].end_address = addr + size;
+
+  mempath[1].header.type = GRUB_EFI_END_DEVICE_PATH_TYPE;
+  mempath[1].header.subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
+  mempath[1].header.length = sizeof (grub_efi_device_path_t);
+
+  b = grub_efi_system_table->boot_services;
+  status = b->load_image (0, grub_efi_image_handle,
+                         (grub_efi_device_path_t *) mempath,
+                         (void *) addr, size, &image_handle);
+  if (status != GRUB_EFI_SUCCESS)
+    return grub_error (GRUB_ERR_BAD_OS, "cannot load image");
+
+  grub_dprintf ("linux", "linux command line: '%s'\n", args);
+
+  /* Convert command line to UCS-2 */
+  loaded_image = grub_efi_get_loaded_image (image_handle);
+  loaded_image->load_options_size = len =
+    (grub_strlen (args) + 1) * sizeof (grub_efi_char16_t);
+  loaded_image->load_options =
+    grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES 
(loaded_image->load_options_size));
+  if (!loaded_image->load_options)
+    return grub_errno;
+
+  loaded_image->load_options_size =
+    2 * grub_utf8_to_utf16 (loaded_image->load_options, len,
+                           (grub_uint8_t *) args, len, NULL);
+
+  grub_dprintf ("linux", "starting image %p\n", image_handle);
+  status = b->start_image (image_handle, 0, NULL);
+
+  /* When successful, not reached */
+  b->unload_image (image_handle);
+  grub_efi_free_pages ((grub_addr_t) loaded_image->load_options,
+                      GRUB_EFI_BYTES_TO_PAGES 
(loaded_image->load_options_size));
+
+  return grub_errno;
+}
+
+static grub_err_t
+grub_linux_boot (void)
+{
+  if (finalize_params_linux () != GRUB_ERR_NONE)
+    return grub_errno;
+
+  return (grub_arch_efi_linux_boot_image((grub_addr_t)kernel_addr,
+                                         kernel_size, linux_args));
+}
+
+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;
+}
+
+static grub_err_t
+grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
+                int argc, char *argv[])
+{
+  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 = grub_efi_allocate_any_pages (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;
+  grub_dprintf ("linux", "[addr=%p, size=0x%x]\n",
+               (void *) 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
+grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+               int argc, char *argv[])
+{
+  grub_file_t file = 0;
+  struct linux_riscv_kernel_header lh;
+
+  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]);
+  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();
+
+  grub_dprintf ("linux", "kernel file size: %lld\n", (long long) kernel_size);
+  kernel_addr = grub_efi_allocate_any_pages (GRUB_EFI_BYTES_TO_PAGES 
(kernel_size));
+  grub_dprintf ("linux", "kernel numpages: %lld\n",
+               (long long) GRUB_EFI_BYTES_TO_PAGES (kernel_size));
+  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_int64_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));
+  grub_create_loader_cmdline (argc, argv,
+                             linux_args + sizeof (LINUX_IMAGE) - 1,
+                             cmdline_size);
+
+  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;
+
+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);
+}
diff --git a/include/grub/riscv32/linux.h b/include/grub/riscv32/linux.h
new file mode 100644
index 000000000..5c70d00b4
--- /dev/null
+++ b/include/grub/riscv32/linux.h
@@ -0,0 +1,41 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  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/>.
+ */
+
+#ifndef GRUB_RISCV32_LINUX_HEADER
+#define GRUB_RISCV32_LINUX_HEADER 1
+
+#define GRUB_LINUX_RISCV_MAGIC_SIGNATURE 0x52534356 /* 'RSCV' */
+
+/* From linux/Documentation/riscv/booting.txt */
+struct linux_riscv_kernel_header
+{
+  grub_uint32_t code0;         /* Executable code */
+  grub_uint32_t code1;         /* Executable code */
+  grub_uint64_t text_offset;    /* Image load offset */
+  grub_uint64_t res0;          /* reserved */
+  grub_uint64_t res1;          /* reserved */
+  grub_uint64_t res2;          /* reserved */
+  grub_uint64_t res3;          /* reserved */
+  grub_uint64_t res4;          /* reserved */
+  grub_uint32_t magic;         /* Magic number, little endian, "RSCV" */
+  grub_uint32_t hdr_offset;    /* Offset of PE/COFF header */
+};
+
+# define linux_arch_kernel_header linux_riscv_kernel_header
+
+#endif /* ! GRUB_RISCV32_LINUX_HEADER */
diff --git a/include/grub/riscv64/linux.h b/include/grub/riscv64/linux.h
new file mode 100644
index 000000000..aa6b8687e
--- /dev/null
+++ b/include/grub/riscv64/linux.h
@@ -0,0 +1,43 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  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/>.
+ */
+
+#ifndef GRUB_RISCV64_LINUX_HEADER
+#define GRUB_RISCV64_LINUX_HEADER 1
+
+#define GRUB_LINUX_RISCV_MAGIC_SIGNATURE 0x52534356 /* 'RSCV' */
+
+#define GRUB_EFI_PE_MAGIC      0x5A4D
+
+/* From linux/Documentation/riscv/booting.txt */
+struct linux_riscv_kernel_header
+{
+  grub_uint32_t code0;         /* Executable code */
+  grub_uint32_t code1;         /* Executable code */
+  grub_uint64_t text_offset;    /* Image load offset */
+  grub_uint64_t res0;          /* reserved */
+  grub_uint64_t res1;          /* reserved */
+  grub_uint64_t res2;          /* reserved */
+  grub_uint64_t res3;          /* reserved */
+  grub_uint64_t res4;          /* reserved */
+  grub_uint32_t magic;         /* Magic number, little endian, "RSCV" */
+  grub_uint32_t hdr_offset;    /* Offset of PE/COFF header */
+};
+
+# define linux_arch_kernel_header linux_riscv_kernel_header
+
+#endif /* ! GRUB_RISCV64_LINUX_HEADER */
-- 
2.12.3




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