[PATCH QEMU-KVM 10/34] test: port readmode tests to multiboot

[Avi Kivity]

Signed-off-by: Avi Kivity <a...@redhat.com>
---
 kvm/user/test/x86/realmode.c   |   52 ++++++++++++++++++++++++++++++++-------
 kvm/user/test/x86/realmode.lds |    6 +----
 2 files changed, 43 insertions(+), 15 deletions(-)

diff --git a/kvm/user/test/x86/realmode.c b/kvm/user/test/x86/realmode.c
index f9e303f..9bf6cb0 100644
--- a/kvm/user/test/x86/realmode.c
+++ b/kvm/user/test/x86/realmode.c
@@ -549,7 +549,7 @@ void test_null(void)
                print_serial("null test: FAIL\n");
 }
 
-void start(void)
+void realmode_start(void)
 {
        test_null();
 
@@ -570,23 +570,55 @@ void start(void)
        exit(0);
 }
 
+unsigned long long r_gdt[] = { 0, 0x9b000000ffff, 0x93000000ffff };
+
+struct __attribute__((packed)) {
+       unsigned short limit;
+       void *base;
+} r_gdt_descr = { sizeof(r_gdt) - 1, &r_gdt };
+
 asm(
+       ".section .init \n\t"
+
+       ".code32 \n\t"
+
+       "mb_magic = 0x1BADB002 \n\t"
+       "mb_flags = 0x0 \n\t"
+
+       "# multiboot header \n\t"
+       ".long mb_magic, mb_flags, 0 - (mb_magic + mb_flags) \n\t"
+
+       ".globl start \n\t"
        ".data \n\t"
        ". = . + 4096 \n\t"
        "stacktop: \n\t"
+
        ".text \n\t"
-       "init: \n\t"
+       "start: \n\t"
+       "lgdt r_gdt_descr \n\t"
+       "ljmp $8, $1f; 1: \n\t"
+       ".code16gcc \n\t"
+       "mov $16, %eax \n\t"
+       "mov %ax, %ds \n\t"
+       "mov %ax, %es \n\t"
+       "mov %ax, %fs \n\t"
+       "mov %ax, %gs \n\t"
+       "mov %ax, %ss \n\t"
+       "mov %cr0, %eax \n\t"
+       "btc $0, %eax \n\t"
+       "mov %eax, %cr0 \n\t"
+       "ljmp $0, $realmode_entry \n\t"
+
+       "realmode_entry: \n\t"
+
        "xor %ax, %ax \n\t"
        "mov %ax, %ds \n\t"
        "mov %ax, %es \n\t"
        "mov %ax, %ss \n\t"
-       "mov $0x4000, %cx \n\t"
-       "xor %esi, %esi \n\t"
-       "mov %esi, %edi \n\t"
-       "rep/addr32/cs/movsl \n\t"
+       "mov %ax, %fs \n\t"
+       "mov %ax, %gs \n\t"
        "mov $stacktop, %sp\n\t"
-       "ljmp $0, $start \n\t"
-       ".pushsection .boot, \"ax\" \n\t"
-       "ljmp $0xf000, $init \n\t"
-       ".popsection"
+       "ljmp $0, $realmode_start \n\t"
+
+       ".code16gcc \n\t"
        );
diff --git a/kvm/user/test/x86/realmode.lds b/kvm/user/test/x86/realmode.lds
index c9cdd7d..c7386b8 100644
--- a/kvm/user/test/x86/realmode.lds
+++ b/kvm/user/test/x86/realmode.lds
@@ -1,16 +1,12 @@
-OUTPUT_FORMAT(binary)
-
 SECTIONS
 {
-    . = 0;
+    . = 16K;
     stext = .;
     .text : { *(.init) *(.text) }
     . = ALIGN(4K);
     .data : { *(.data) *(.rodata*) }
     . = ALIGN(16);
     .bss : { *(.bss) }
-    . = 0xfff0;
-    .boot : { *(.boot) }
     edata = .;
 }
 
-- 
1.6.4.1

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