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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC PATCH 6/7] x86/boot: Copy 16-bit boot variables back up to Xen image
From: David Woodhouse <dwmw@xxxxxxxxxxxx>
Ditch the bootsym() access from C code for the variables populated by
16-bit boot code. As well as being cleaner this also paves the way for
not having the 16-bit boot code in low memory for no-real-mode or EFI
loader boots at all.
Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx>
---
xen/arch/x86/boot/edd.S | 2 ++
xen/arch/x86/boot/head.S | 16 +++++++++++++++
xen/arch/x86/boot/mem.S | 2 ++
xen/arch/x86/boot/trampoline.S | 33 ++++++++++++++++++++++++++++---
xen/arch/x86/boot/video.S | 30 +++++++++++++++-------------
xen/arch/x86/platform_hypercall.c | 18 ++++++++---------
xen/arch/x86/setup.c | 23 +++++++++++----------
xen/arch/x86/xen.lds.S | 8 +++++++-
xen/include/asm-x86/edd.h | 1 -
9 files changed, 93 insertions(+), 40 deletions(-)
diff --git a/xen/arch/x86/boot/edd.S b/xen/arch/x86/boot/edd.S
index 434bbbd960..138d04c964 100644
--- a/xen/arch/x86/boot/edd.S
+++ b/xen/arch/x86/boot/edd.S
@@ -163,6 +163,7 @@ edd_done:
.Ledd_mbr_sig_skip:
ret
+ .pushsection .data.boot16, "aw", @progbits
GLOBAL(boot_edd_info_nr)
.byte 0
GLOBAL(boot_mbr_signature_nr)
@@ -171,3 +172,4 @@ GLOBAL(boot_mbr_signature)
.fill EDD_MBR_SIG_MAX*8,1,0
GLOBAL(boot_edd_info)
.fill EDD_INFO_MAX * (EDDEXTSIZE + EDDPARMSIZE), 1, 0
+ .popsection
diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boot/head.S
index 82342769c7..7d6c8d3292 100644
--- a/xen/arch/x86/boot/head.S
+++ b/xen/arch/x86/boot/head.S
@@ -732,6 +732,17 @@ trampoline_setup:
cmp $sym_offs(__bootsym_seg_stop),%edi
jb 1b
+ /* Relocations for the boot data section. */
+ mov sym_fs(trampoline_phys),%edx
+ add $(boot_trampoline_end - boot_trampoline_start),%edx
+ mov $sym_offs(__bootdatasym_rel_start),%edi
+1:
+ mov %fs:(%edi),%eax
+ add %edx,%fs:(%edi,%eax)
+ add $4,%edi
+ cmp $sym_offs(__bootdatasym_rel_stop),%edi
+ jb 1b
+
/* Do not parse command line on EFI platform here. */
cmpb $0,sym_fs(efi_platform)
jnz 1f
@@ -769,6 +780,11 @@ trampoline_setup:
mov $((boot_trampoline_end - boot_trampoline_start) / 4),%ecx
rep movsl %fs:(%esi),%es:(%edi)
+ /* Copy boot data template to low memory. */
+ mov $sym_offs(bootdata_start),%esi
+ mov $((bootdata_end - bootdata_start + 3) / 4),%ecx
+ rep movsl %fs:(%esi),%es:(%edi)
+
/* Jump into the relocated trampoline. */
lret
diff --git a/xen/arch/x86/boot/mem.S b/xen/arch/x86/boot/mem.S
index aa39608442..86f0fa9af7 100644
--- a/xen/arch/x86/boot/mem.S
+++ b/xen/arch/x86/boot/mem.S
@@ -67,6 +67,7 @@ get_memory_map:
ret
.align 4
+ .pushsection .data.boot16, "aw", @progbits
GLOBAL(bios_e820map)
.fill E820_BIOS_MAX*20,1,0
GLOBAL(bios_e820nr)
@@ -75,3 +76,4 @@ GLOBAL(lowmem_kb)
.long 0
GLOBAL(highmem_kb)
.long 0
+ .popsection
diff --git a/xen/arch/x86/boot/trampoline.S b/xen/arch/x86/boot/trampoline.S
index 0f4a740fcb..fdfee2edb1 100644
--- a/xen/arch/x86/boot/trampoline.S
+++ b/xen/arch/x86/boot/trampoline.S
@@ -47,11 +47,15 @@
.long 111b - (off) - .; \
.popsection
-#define bootdatasym(s) ((s)-boot_trampoline_start)
+ .pushsection .data.boot16, "aw", @progbits
+GLOBAL(bootdata_start)
+ .popsection
+
+#define bootdatasym(s)
((s)-bootdata_start+(boot_trampoline_end-boot_trampoline_start))
#define bootdatasym_rel(sym, off, opnd...) \
bootdatasym(sym),##opnd; \
111:; \
- .pushsection .bootdatasym_rel, "a";\
+ .pushsection .bootsym_rel, "a";\
.long 111b - (off) - .; \
.popsection
@@ -100,7 +104,7 @@ GLOBAL(trampoline_cpu_started)
.word 0
idt_48: .word 0, 0, 0 # base = limit = 0
.word 0
-gdt_48: .word 6*8-1
+gdt_48: .word 7*8-1
.long tramp32sym_rel(trampoline_gdt,4)
/* Start of tramp32sym section which can be used in place during boot */
@@ -312,6 +316,23 @@ trampoline_boot_cpu_entry:
mov %eax,%gs
mov %eax,%ss
+ /*
+ * Copy locally-gathered data back up into the Xen physical image
+ */
+ mov $BOOT_FS,%eax
+ mov %eax,%es
+
+ mov $sym_offs(bootdata_end),%ecx
+ mov $sym_offs(bootdata_start),%edi
+ sub %edi,%ecx
+ mov $bootdatasym_rel(bootdata_start,4,%esi)
+ rep movsb %ds:(%esi),%es:(%edi)
+
+ /*
+ * %es still points to BOOT_FS but trampoline_protmode_entry
+ * reloads it anyway.
+ */
+
/* EBX == 0 indicates we are the BP (Boot Processor). */
xor %ebx,%ebx
@@ -339,8 +360,10 @@ vesa_size:
.word 0,0,0 /* width x depth x height */
#endif
+ .pushsection .data.boot16, "aw", @progbits
GLOBAL(kbd_shift_flags)
.byte 0
+ .popsection
rm_idt: .word 256*4-1, 0, 0
@@ -349,3 +372,7 @@ rm_idt: .word 256*4-1, 0, 0
#ifdef CONFIG_VIDEO
#include "video.S"
#endif
+
+ .pushsection .data.boot16, "aw", @progbits
+GLOBAL(bootdata_end)
+ .popsection
diff --git a/xen/arch/x86/boot/video.S b/xen/arch/x86/boot/video.S
index 5087c6a4d5..4608464b77 100644
--- a/xen/arch/x86/boot/video.S
+++ b/xen/arch/x86/boot/video.S
@@ -15,10 +15,10 @@
#include "video.h"
-/* Scratch space layout: boot_trampoline_end to boot_trampoline_end+0x1000. */
-#define modelist bootsym(boot_trampoline_end) /* 2kB (256 entries) */
-#define vesa_glob_info (modelist + 0x800) /* 1kB */
-#define vesa_mode_info (vesa_glob_info + 0x400) /* 1kB */
+/* Scratch space layout: bootdata_end to bootdata_end+0x1000. */
+#define modelist(t) bootdatasym_rel(bootdata_end,2,t) /* 2KiB
(256 entries) */
+#define vesa_glob_info(t) bootdatasym_rel((bootdata_end+0x800),2,t) /* 1KiB */
+#define vesa_mode_info(t) bootdatasym_rel((bootdata_end+0xc00),2,t) /* 1KiB */
/* Retrieve Extended Display Identification Data. */
#define CONFIG_FIRMWARE_EDID
@@ -113,7 +113,7 @@ mopar2: movb %al, _param(PARAM_VIDEO_LINES)
# Fetching of VESA frame buffer parameters
mopar_gr:
- leaw vesa_mode_info, %di
+ leaw vesa_mode_info(%di)
movb $0x23, _param(PARAM_HAVE_VGA)
movw 16(%di), %ax
movw %ax, _param(PARAM_LFB_LINELENGTH)
@@ -134,7 +134,7 @@ mopar_gr:
movw %ax, _param(PARAM_VESA_ATTRIB)
# get video mem size
- leaw vesa_glob_info, %di
+ leaw vesa_glob_info(%di)
xorl %eax, %eax
movw 18(%di), %ax
movl %eax, _param(PARAM_LFB_SIZE)
@@ -226,7 +226,7 @@ an1: call prtstr
leaw bootsym(listhdr), %si # Table header
call prtstr
movb $0x30, %dl # DL holds mode number
- leaw modelist, %si
+ leaw modelist(%si)
lm1: cmpw $ASK_VGA, (%si) # End?
jz lm2
@@ -435,13 +435,13 @@ setmenu:
jmp mode_set
check_vesa:
- leaw vesa_glob_info, %di
+ leaw vesa_glob_info(%di)
movw $0x4f00, %ax
int $0x10
cmpw $0x004f, %ax
jnz setbad
- leaw vesa_mode_info, %di
+ leaw vesa_mode_info(%di)
subb $VIDEO_FIRST_VESA>>8, %bh
movw %bx, %cx # Get mode information structure
movw $0x4f01, %ax
@@ -509,7 +509,7 @@ inidx: outb %al, %dx # Read from indexed
VGA register
setvesabysize:
call mode_table
- leaw modelist,%si
+ leaw modelist(%si)
1: add $8,%si
cmpw $ASK_VGA,-8(%si) # End?
je _setbad
@@ -669,7 +669,7 @@ mode_table:
orw %di, %di
jnz mtab1
- leaw modelist, %di # Store standard modes:
+ leaw modelist(%di) # Store standard modes:
movw $VIDEO_80x25,(%di) # The 80x25 mode (ALL)
movw $0x50,2(%di)
movw $0x19,4(%di)
@@ -684,7 +684,7 @@ mode_table:
movw $ASK_VGA, (%di) # End marker
movw %di, bootsym(mt_end)
-mtab1: leaw modelist, %si # SI=mode list, DI=list end
+mtab1: leaw modelist(%si) # SI=mode list, DI=list end
ret0: ret
# Modes usable on all standard VGAs
@@ -700,7 +700,7 @@ vga_modes_end:
# Detect VESA modes.
vesa_modes:
movw %di, %bp # BP=original mode table end
- leaw vesa_glob_info, %di
+ leaw vesa_glob_info(%di)
movw $0x4f00, %ax # VESA Get card info call
int $0x10
movw %di, %si
@@ -897,7 +897,7 @@ store_edid:
cmpb $1, bootsym(opt_edid) # EDID disabled on cmdline (edid=no)?
je .Lno_edid
- leaw vesa_glob_info, %di
+ leaw vesa_glob_info(%di)
movw $0x4f00, %ax
int $0x10
cmpw $0x004f, %ax
@@ -990,6 +990,7 @@ name_bann: .asciz "Video adapter: "
force_size: .word 0 # Use this size instead of the one in BIOS vars
+ .pushsection .data.boot16, "aw", @progbits
GLOBAL(boot_vid_info)
.byte 0, 0 /* orig_x, orig_y */
.byte 3 /* text mode 3 */
@@ -1001,3 +1002,4 @@ GLOBAL(boot_edid_info)
.fill 128,1,0x13
GLOBAL(boot_edid_caps)
.word 0x1313
+ .popsection
diff --git a/xen/arch/x86/platform_hypercall.c
b/xen/arch/x86/platform_hypercall.c
index ea18c3215a..5c8953ae19 100644
--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -333,10 +333,10 @@ ret_t
do_platform_op(XEN_GUEST_HANDLE_PARAM(xen_platform_op_t) u_xenpf_op)
u16 length;
ret = -ESRCH;
- if ( op->u.firmware_info.index >= bootsym(boot_edd_info_nr) )
+ if ( op->u.firmware_info.index >= boot_edd_info_nr )
break;
- info = bootsym(boot_edd_info) + op->u.firmware_info.index;
+ info = boot_edd_info + op->u.firmware_info.index;
/* Transfer the EDD info block. */
ret = -EFAULT;
@@ -372,10 +372,10 @@ ret_t
do_platform_op(XEN_GUEST_HANDLE_PARAM(xen_platform_op_t) u_xenpf_op)
const struct mbr_signature *sig;
ret = -ESRCH;
- if ( op->u.firmware_info.index >= bootsym(boot_mbr_signature_nr) )
+ if ( op->u.firmware_info.index >= boot_mbr_signature_nr )
break;
- sig = bootsym(boot_mbr_signature) + op->u.firmware_info.index;
+ sig = boot_mbr_signature + op->u.firmware_info.index;
op->u.firmware_info.u.disk_mbr_signature.device = sig->device;
op->u.firmware_info.u.disk_mbr_signature.mbr_signature =
@@ -391,13 +391,13 @@ ret_t
do_platform_op(XEN_GUEST_HANDLE_PARAM(xen_platform_op_t) u_xenpf_op)
#ifdef CONFIG_VIDEO
if ( op->u.firmware_info.index != 0 )
break;
- if ( *(u32 *)bootsym(boot_edid_info) == 0x13131313 )
+ if ( *(u32 *)boot_edid_info == 0x13131313 )
break;
op->u.firmware_info.u.vbeddc_info.capabilities =
- bootsym(boot_edid_caps);
+ boot_edid_caps;
op->u.firmware_info.u.vbeddc_info.edid_transfer_time =
- bootsym(boot_edid_caps) >> 8;
+ boot_edid_caps >> 8;
ret = 0;
if ( __copy_field_to_guest(u_xenpf_op, op, u.firmware_info.
@@ -405,7 +405,7 @@ ret_t
do_platform_op(XEN_GUEST_HANDLE_PARAM(xen_platform_op_t) u_xenpf_op)
__copy_field_to_guest(u_xenpf_op, op, u.firmware_info.
u.vbeddc_info.edid_transfer_time) ||
copy_to_compat(op->u.firmware_info.u.vbeddc_info.edid,
- bootsym(boot_edid_info), 128) )
+ boot_edid_info, 128) )
ret = -EFAULT;
#endif
break;
@@ -422,7 +422,7 @@ ret_t
do_platform_op(XEN_GUEST_HANDLE_PARAM(xen_platform_op_t) u_xenpf_op)
if ( op->u.firmware_info.index != 0 )
break;
- op->u.firmware_info.u.kbd_shift_flags = bootsym(kbd_shift_flags);
+ op->u.firmware_info.u.kbd_shift_flags = kbd_shift_flags;
ret = 0;
if ( __copy_field_to_guest(u_xenpf_op, op,
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index b714e3c237..4dd4c4161c 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -507,7 +507,7 @@ extern struct boot_video_info boot_vid_info;
static void __init parse_video_info(void)
{
#ifdef CONFIG_VIDEO
- struct boot_video_info *bvi = &bootsym(boot_vid_info);
+ struct boot_video_info *bvi = &boot_vid_info;
/* vga_console_info is filled directly on EFI platform. */
if ( efi_enabled(EFI_BOOT) )
@@ -666,12 +666,11 @@ static char * __init cmdline_cook(char *p, const char
*loader_name)
static int copy_bios_e820(struct e820entry *map, unsigned int limit)
{
- unsigned int n = bootsym(bios_e820nr);
+ unsigned int n = bios_e820nr;
if (n > limit)
n = limit;
-
if (n)
- memcpy(map, bootsym(bios_e820map), sizeof(*map) * n);
+ memcpy(map, bios_e820map, sizeof(*map) * n);
return n;
}
@@ -802,15 +801,15 @@ void __init noreturn __start_xen(unsigned long mbi_p)
}
/* Print VBE/DDC EDID information. */
- if ( bootsym(boot_edid_caps) != 0x1313 )
+ if ( boot_edid_caps != 0x1313 )
{
- u16 caps = bootsym(boot_edid_caps);
+ u16 caps = boot_edid_caps;
printk(" VBE/DDC methods:%s%s%s; ",
(caps & 1) ? " V1" : "",
(caps & 2) ? " V2" : "",
!(caps & 3) ? " none" : "");
printk("EDID transfer time: %d seconds\n", caps >> 8);
- if ( *(u32 *)bootsym(boot_edid_info) == 0x13131313 )
+ if ( *(u32 *)boot_edid_info == 0x13131313 )
{
printk(" EDID info not retrieved because ");
if ( !(caps & 3) )
@@ -825,9 +824,9 @@ void __init noreturn __start_xen(unsigned long mbi_p)
printk("Disc information:\n");
printk(" Found %d MBR signatures\n",
- bootsym(boot_mbr_signature_nr));
+ boot_mbr_signature_nr);
printk(" Found %d EDD information structures\n",
- bootsym(boot_edd_info_nr));
+ boot_edd_info_nr);
/* Check that we have at least one Multiboot module. */
if ( !(mbi->flags & MBI_MODULES) || (mbi->mods_count == 0) )
@@ -899,14 +898,14 @@ void __init noreturn __start_xen(unsigned long mbi_p)
bytes += map->size + 4;
}
}
- else if ( bootsym(lowmem_kb) )
+ else if ( lowmem_kb )
{
memmap_type = "Xen-e801";
e820_raw.map[0].addr = 0;
- e820_raw.map[0].size = bootsym(lowmem_kb) << 10;
+ e820_raw.map[0].size = lowmem_kb << 10;
e820_raw.map[0].type = E820_RAM;
e820_raw.map[1].addr = 0x100000;
- e820_raw.map[1].size = bootsym(highmem_kb) << 10;
+ e820_raw.map[1].size = highmem_kb << 10;
e820_raw.map[1].type = E820_RAM;
e820_raw.nr_map = 2;
}
diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 5f36b88b92..436781cefa 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -228,11 +228,13 @@ SECTIONS
__trampoline32_rel_stop = .;
__bootsym_rel_start = .;
*(.bootsym_rel)
- *(.bootdatasym_rel)
__bootsym_rel_stop = .;
__bootsym_seg_start = .;
*(.bootsym_seg)
__bootsym_seg_stop = .;
+ __bootdatasym_rel_start = .;
+ *(.bootdatasym_rel)
+ __bootdatasym_rel_stop = .;
/*
* struct alt_inst entries. From the header (alternative.h):
* "Alternative instructions for different CPU types or capabilities"
@@ -275,6 +277,10 @@ SECTIONS
DECL_SECTION(.data) {
*(.data.page_aligned)
*(.data)
+ . = ALIGN(16);
+ __bootdata_start = .;
+ *(.data.boot16)
+ __bootdata_end = .;
*(.data.rel)
*(.data.rel.*)
CONSTRUCTORS
diff --git a/xen/include/asm-x86/edd.h b/xen/include/asm-x86/edd.h
index afaa23732a..a4d6b4d90e 100644
--- a/xen/include/asm-x86/edd.h
+++ b/xen/include/asm-x86/edd.h
@@ -143,7 +143,6 @@ struct __packed mbr_signature {
u32 signature;
};
-/* These all reside in the boot trampoline. Access via bootsym(). */
extern struct mbr_signature boot_mbr_signature[];
extern u8 boot_mbr_signature_nr;
extern struct edd_info boot_edd_info[];
--
2.17.2
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