From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001

From: Peter Jones <pjones@redhat.com>

Date: Thu, 13 Sep 2018 14:42:34 -0400

Subject: [PATCH] x86-efi: Re-arrange grub_cmd_linux() a little bit.

This just helps the next patch be easier to read.

Signed-off-by: Peter Jones <pjones@redhat.com>

---

 grub-core/loader/i386/efi/linux.c | 75 +++++++++++++++++++++------------------

 1 file changed, 41 insertions(+), 34 deletions(-)

diff --git a/grub-core/loader/i386/efi/linux.c b/grub-core/loader/i386/efi/linux.c

index 2f0336809e7..5f48fa55619 100644

--- a/grub-core/loader/i386/efi/linux.c

+++ b/grub-core/loader/i386/efi/linux.c

@@ -243,32 +243,9 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),

       goto fail;

     }

-  params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_ALLOCATION_ADDRESS,

-					BYTES_TO_PAGES(sizeof(*params)));

-  if (!params)

-    params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_USABLE_ADDRESS,

-					  BYTES_TO_PAGES(sizeof(*params)));

-  if (! params)

-    {

-      grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters");

-      goto fail;

-    }

+  lh = (struct linux_i386_kernel_header *)kernel;

+  grub_dprintf ("linux", "original lh is at %p\n", kernel);

-  grub_dprintf ("linux", "params = %p\n", params);

-

-  grub_memset (params, 0, sizeof(*params));

-

-  setup_header_end_offset = *((grub_uint8_t *)kernel + 0x201);

-  grub_dprintf ("linux", "copying %lu bytes from %p to %p\n",

-		MIN((grub_size_t)0x202+setup_header_end_offset,

-		    sizeof (*params)) - 0x1f1,

-		(grub_uint8_t *)kernel + 0x1f1,

-		(grub_uint8_t *)params + 0x1f1);

-  grub_memcpy ((grub_uint8_t *)params + 0x1f1,

-	       (grub_uint8_t *)kernel + 0x1f1,

-		MIN((grub_size_t)0x202+setup_header_end_offset,sizeof (*params)) - 0x1f1);

-  lh = (struct linux_i386_kernel_header *)params;

-  grub_dprintf ("linux", "lh is at %p\n", lh);

   grub_dprintf ("linux", "checking lh->boot_flag\n");

   if (lh->boot_flag != grub_cpu_to_le16 (0xaa55))

     {

@@ -316,6 +293,34 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),

     }

 #endif

+  params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_ALLOCATION_ADDRESS,

+					BYTES_TO_PAGES(sizeof(*params)));

+  if (!params)

+    params = grub_efi_allocate_pages_max (GRUB_EFI_MAX_USABLE_ADDRESS,

+					  BYTES_TO_PAGES(sizeof(*params)));

+  if (! params)

+    {

+      grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate kernel parameters");

+      goto fail;

+    }

+

+  grub_dprintf ("linux", "params = %p\n", params);

+

+  grub_memset (params, 0, sizeof(*params));

+

+  setup_header_end_offset = *((grub_uint8_t *)kernel + 0x201);

+  grub_dprintf ("linux", "copying %lu bytes from %p to %p\n",

+		MIN((grub_size_t)0x202+setup_header_end_offset,

+		    sizeof (*params)) - 0x1f1,

+		(grub_uint8_t *)kernel + 0x1f1,

+		(grub_uint8_t *)params + 0x1f1);

+  grub_memcpy ((grub_uint8_t *)params + 0x1f1,

+	       (grub_uint8_t *)kernel + 0x1f1,

+		MIN((grub_size_t)0x202+setup_header_end_offset,sizeof (*params)) - 0x1f1);

+

+  lh = (struct linux_i386_kernel_header *)params;

+  grub_dprintf ("linux", "new lh is at %p\n", lh);

+

   grub_dprintf ("linux", "setting up cmdline\n");

   linux_cmdline = grub_efi_allocate_pages_max(GRUB_EFI_MAX_ALLOCATION_ADDRESS,

 					      BYTES_TO_PAGES(lh->cmdline_size + 1));

@@ -341,8 +346,8 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),

   grub_dprintf ("linux", "setting lh->cmd_line_ptr\n");

   lh->cmd_line_ptr = (grub_uint32_t)(grub_addr_t)linux_cmdline;

-  grub_dprintf ("linux", "computing handover offset\n");

   handover_offset = lh->handover_offset;

+  grub_dprintf("linux", "handover_offset: %08x\n", handover_offset);

   start = (lh->setup_sects + 1) * 512;

@@ -359,26 +364,28 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),

       grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("can't allocate kernel"));

       goto fail;

     }

-

-  grub_dprintf ("linux", "kernel_mem = %lx\n", (unsigned long) kernel_mem);

+  grub_dprintf("linux", "kernel_mem = %p\n", kernel_mem);

   grub_loader_set (grub_linuxefi_boot, grub_linuxefi_unload, 0);

-  loaded=1;

+

+  loaded = 1;

+

   grub_dprintf ("linux", "setting lh->code32_start to %p\n", kernel_mem);

   lh->code32_start = (grub_uint32_t)(grub_addr_t) kernel_mem;

   grub_memcpy (kernel_mem, (char *)kernel + start, filelen - start);

-  grub_dprintf ("linux", "setting lh->type_of_loader\n");

   lh->type_of_loader = 0x6;

+  grub_dprintf ("linux", "setting lh->type_of_loader = 0x%02x\n",

+		lh->type_of_loader);

-  grub_dprintf ("linux", "setting lh->ext_loader_{type,ver}\n");

   params->ext_loader_type = 0;

   params->ext_loader_ver = 2;

-  grub_dprintf("linux", "kernel_mem: %p handover_offset: %08x\n",

-	       kernel_mem, handover_offset);

+  grub_dprintf ("linux",

+		"setting lh->ext_loader_{type,ver} = {0x%02x,0x%02x}\n",

+		params->ext_loader_type, params->ext_loader_ver);

- fail:

+fail:

   if (file)

     grub_file_close (file);