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[Qemu-devel] [PATCH 5/6] Don't use unreserved memory in BIOS.


From: Gleb Natapov
Subject: [Qemu-devel] [PATCH 5/6] Don't use unreserved memory in BIOS.
Date: Mon, 27 Oct 2008 12:13:15 +0200
User-agent: StGIT/0.14.2

Use only first page and last page of low memory. OSes assumes that first
page is used by bios and last page is reserved in e820 map.

Signed-off-by: Gleb Natapov <address@hidden>
---

 bios/rombios.c   |    6 +++---
 bios/rombios.h   |    2 +-
 bios/rombios32.c |    2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/bios/rombios.c b/bios/rombios.c
index c4c1e35..19f0e93 100644
--- a/bios/rombios.c
+++ b/bios/rombios.c
@@ -4541,7 +4541,7 @@ ASM_END
                 {
                     case 0:
                         set_e820_range(ES, regs.u.r16.di,
-                                       0x0000000L, 0x0009fc00L, 1);
+                                       0x0000000L, 0x0009f000L, 1);
                         regs.u.r32.ebx = 1;
                         regs.u.r32.eax = 0x534D4150;
                         regs.u.r32.ecx = 0x14;
@@ -4550,7 +4550,7 @@ ASM_END
                         break;
                     case 1:
                         set_e820_range(ES, regs.u.r16.di,
-                                       0x0009fc00L, 0x000a0000L, 2);
+                                       0x0009f000L, 0x000a0000L, 2);
                         regs.u.r32.ebx = 2;
                         regs.u.r32.eax = 0x534D4150;
                         regs.u.r32.ecx = 0x14;
@@ -10021,7 +10021,7 @@ rombios32_05:
   cld
 
   ;; init the stack pointer
-  mov esp, #0x00080000
+  mov esp, #0x9fbf0
 
   ;; pass pointer to s3_resume_flag and s3_resume_vector to rombios32
   push #0x04b0
diff --git a/bios/rombios.h b/bios/rombios.h
index f0ed88e..57b0f46 100644
--- a/bios/rombios.h
+++ b/bios/rombios.h
@@ -56,7 +56,7 @@
 #define ACPI_DATA_SIZE    0x00010000L
 #define PM_IO_BASE        0xb000
 #define SMB_IO_BASE       0xb100
-#define CPU_COUNT_ADDR    0xf000
+#define CPU_COUNT_ADDR    0x0500
 
   // Define the application NAME
 #if defined(BX_QEMU)
diff --git a/bios/rombios32.c b/bios/rombios32.c
index e887d71..c192cf3 100755
--- a/bios/rombios32.c
+++ b/bios/rombios32.c
@@ -57,7 +57,7 @@ typedef unsigned long long uint64_t;
 
 #define APIC_ENABLED 0x0100
 
-#define AP_BOOT_ADDR 0x10000
+#define AP_BOOT_ADDR 0x9f000
 
 #define MPTABLE_MAX_SIZE  0x00002000
 #define SMI_CMD_IO_ADDR   0xb2





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