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From d8d7d9fd00cfac60bb26d66c2a1ce07275c35b8b Mon Sep 17 00:00:00 2001
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From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
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Date: Thu, 28 Feb 2013 22:48:41 +0100
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Subject: [PATCH 171/482] Enable linux16 on non-BIOS systems for i.a.
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memtest.
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* grub-core/loader/i386/pc/linux.c (grub_cmd_linux): Handle hole at 0
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correctly.
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* grub-core/Makefile.core.def (linux16): Enable on all x86 flavours.
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---
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ChangeLog | 8 ++++++
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grub-core/Makefile.core.def | 6 ++--
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grub-core/loader/i386/pc/linux.c | 60 ++++++++++++++++++++++++++++------------
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3 files changed, 54 insertions(+), 20 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index 0eb0516..135586c 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,5 +1,13 @@
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2013-02-28 Vladimir Serbinenko <phcoder@gmail.com>
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+ Enable linux16 on non-BIOS systems for i.a. memtest.
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+
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+ * grub-core/loader/i386/pc/linux.c (grub_cmd_linux): Handle hole at 0
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+ correctly.
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+ * grub-core/Makefile.core.def (linux16): Enable on all x86 flavours.
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+
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+2013-02-28 Vladimir Serbinenko <phcoder@gmail.com>
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+
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* grub-core/kern/i386/coreboot/mmap.c (grub_linuxbios_table_iterate):
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Fix end of table condition.
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diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
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index 4b0e6e6..93ff2a8 100644
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--- a/grub-core/Makefile.core.def
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+++ b/grub-core/Makefile.core.def
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@@ -1390,9 +1390,9 @@ module = {
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module = {
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name = linux16;
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- i386_pc = loader/i386/pc/linux.c;
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- i386_pc = lib/cmdline.c;
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- enable = i386_pc;
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+ common = loader/i386/pc/linux.c;
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+ common = lib/cmdline.c;
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+ enable = x86;
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};
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module = {
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diff --git a/grub-core/loader/i386/pc/linux.c b/grub-core/loader/i386/pc/linux.c
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index 4eeb1b6..39206c8 100644
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--- a/grub-core/loader/i386/pc/linux.c
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+++ b/grub-core/loader/i386/pc/linux.c
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@@ -79,6 +79,42 @@ grub_linux_unload (void)
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return GRUB_ERR_NONE;
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}
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+static int
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+target_hook (grub_uint64_t addr, grub_uint64_t size, grub_memory_type_t type,
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+ void *data)
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+{
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+ grub_uint64_t *result = data;
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+ grub_uint64_t candidate;
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+
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+ if (type != GRUB_MEMORY_AVAILABLE)
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+ return 0;
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+ if (addr >= 0xa0000)
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+ return 0;
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+ if (addr + size >= 0xa0000)
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+ size = 0xa0000 - addr;
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+
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+ /* Put the real mode part at as a high location as possible. */
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+ candidate = addr + size - (GRUB_LINUX_CL_OFFSET + maximal_cmdline_size);
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+ /* But it must not exceed the traditional area. */
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+ if (candidate > GRUB_LINUX_OLD_REAL_MODE_ADDR)
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+ candidate = GRUB_LINUX_OLD_REAL_MODE_ADDR;
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+ if (candidate < addr)
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+ return 0;
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+
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+ if (candidate > *result || *result == (grub_uint64_t) -1)
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+ *result = candidate;
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+ return 0;
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+}
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+
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+static grub_addr_t
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+grub_find_real_target (void)
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+{
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+ grub_uint64_t result = (grub_uint64_t) -1;
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+
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+ grub_mmap_iterate (target_hook, &result);
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+ return result;
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+}
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+
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static grub_err_t
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grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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@@ -141,12 +177,13 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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if (grub_le_to_cpu16 (lh.version) >= 0x0206)
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maximal_cmdline_size = grub_le_to_cpu32 (lh.cmdline_size) + 1;
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- /* Put the real mode part at as a high location as possible. */
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- grub_linux_real_target = grub_mmap_get_lower ()
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- - (GRUB_LINUX_CL_OFFSET + maximal_cmdline_size);
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- /* But it must not exceed the traditional area. */
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- if (grub_linux_real_target > GRUB_LINUX_OLD_REAL_MODE_ADDR)
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- grub_linux_real_target = GRUB_LINUX_OLD_REAL_MODE_ADDR;
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+ grub_linux_real_target = grub_find_real_target ();
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+ if (grub_linux_real_target == (grub_addr_t)-1)
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+ {
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+ grub_error (GRUB_ERR_OUT_OF_RANGE,
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+ "no appropriate low memory found");
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+ goto fail;
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+ }
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if (grub_le_to_cpu16 (lh.version) >= 0x0201)
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{
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@@ -193,17 +230,6 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
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goto fail;
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}
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- if (grub_linux_real_target + GRUB_LINUX_CL_OFFSET + maximal_cmdline_size
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- > grub_mmap_get_lower ())
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- {
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- grub_error (GRUB_ERR_OUT_OF_RANGE,
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- "too small lower memory (0x%x > 0x%x)",
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- grub_linux_real_target + GRUB_LINUX_CL_OFFSET
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- + maximal_cmdline_size,
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- (int) grub_mmap_get_lower ());
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- goto fail;
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- }
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-
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grub_dprintf ("linux", "[Linux-%s, setup=0x%x, size=0x%x]\n",
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grub_linux_is_bzimage ? "bzImage" : "zImage", real_size,
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grub_linux16_prot_size);
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--
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1.8.2.1
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