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Subject[PATCH 2.5.12] x86 Boot enhancements, heap 5/11
From
Date
Please apply,

This patch introduces better heap management into setup.S
this allows a compiled in command line to be introduced later on.

Eric

diff -uNr linux-2.5.12.boot.syntax/arch/i386/boot/setup.S linux-2.5.12.boot.heap/arch/i386/boot/setup.S
--- linux-2.5.12.boot.syntax/arch/i386/boot/setup.S Wed May 1 09:39:11 2002
+++ linux-2.5.12.boot.heap/arch/i386/boot/setup.S Wed May 1 09:39:29 2002
@@ -65,6 +65,8 @@
#define KERNEL_START HIGH_BASE /* bzImage */
#endif

+#define DELTA_BOOTSECT 512
+
INITSEG = DEF_INITSEG # 0x9000, we move boot here, out of the way
SYSSEG = DEF_SYSSEG # 0x1000, system loaded at 0x10000 (65536).
SETUPSEG = DEF_SETUPSEG # 0x9020, this is the current segment
@@ -73,15 +75,10 @@
DELTA_INITSEG = SETUPSEG - INITSEG # 0x0020

.code16
-.globl begtext, begdata, begbss, endtext, enddata, endbss
+.globl _setup, _esetup

.text
-begtext:
-.data
-begdata:
-.bss
-begbss:
-.text
+_setup:

start:
jmp trampoline
@@ -137,7 +134,7 @@
bootsect_kludge:
.word bootsect_helper, SETUPSEG

-heap_end_ptr: .word modelist+1024 # (Header version 0x0201 or later)
+heap_end_ptr: .word _esetup_heap # (Header version 0x0201 or later)
# space from here (exclusive) down to
# end of setup code can be used by setup
# for local heap purposes.
@@ -162,8 +159,12 @@
# The highest safe address for
# the contents of an initrd

+# variables private to setup.S (not for bootloaders)
+real_filesz: # Datasize of the real mode kernel
+ .long (_esetup - _setup) + DELTA_BOOTSECT
trampoline: call start_of_setup
- .space 1024
+ # Don't let the E820 map overlap code
+ . = (E820MAP - DELTA_BOOTSECT) + (E820MAX * E820ENTRY_SIZE)
# End of setup header #####################################################

start_of_setup:
@@ -1042,11 +1043,8 @@
# After this point, there is some free space which is used by the video mode
# handling code to store the temporary mode table (not used by the kernel).

-modelist:
-
-.text
-endtext:
-.data
-enddata:
-.bss
-endbss:
+_esetup:
+.section ".setup.heap", "a", @nobits
+_setup_heap:
+. = DEF_HEAP_SIZE
+_esetup_heap:
diff -uNr linux-2.5.12.boot.syntax/arch/i386/boot/video.S linux-2.5.12.boot.heap/arch/i386/boot/video.S
--- linux-2.5.12.boot.syntax/arch/i386/boot/video.S Thu Jul 5 12:28:16 2001
+++ linux-2.5.12.boot.heap/arch/i386/boot/video.S Wed May 1 09:39:29 2002
@@ -117,6 +117,12 @@
xorw %ax, %ax
movw %ax, %gs # GS is zero
cld
+
+ # Setup the heap
+ movl real_filesz, %eax
+ subl $DELTA_BOOTSECT, %eax
+ movw %ax, heap_start
+
call basic_detect # Basic adapter type testing (EGA/VGA/MDA/CGA)
#ifdef CONFIG_VIDEO_SELECT
movw %fs:(0x01fa), %ax # User selected video mode
@@ -201,7 +207,7 @@
#ifdef CONFIG_VIDEO_SELECT
# Fetching of VESA frame buffer parameters
mopar_gr:
- leaw modelist+1024, %di
+ movw heap_start, %di
movb $0x23, %fs:(PARAM_HAVE_VGA)
movw 16(%di), %ax
movw %ax, %fs:(PARAM_LFB_LINELENGTH)
@@ -223,7 +229,7 @@
movl %eax, %fs:(PARAM_LFB_COLORS+4)

# get video mem size
- leaw modelist+1024, %di
+ movw heap_start, %di
movw $0x4f00, %ax
int $0x10
xorl %eax, %eax
@@ -284,7 +290,7 @@
leaw listhdr, %si # Table header
call prtstr
movb $0x30, %dl # DL holds mode number
- leaw modelist, %si
+ movw modelist, %si
lm1: cmpw $ASK_VGA, (%si) # End?
jz lm2

@@ -529,7 +535,7 @@
jmp _m_s

check_vesa:
- leaw modelist+1024, %di
+ movw heap_start, %di
subb $VIDEO_FIRST_VESA>>8, %bh
movw %bx, %cx # Get mode information structure
movw $0x4f01, %ax
@@ -774,12 +780,13 @@
mulb %ah
movw %ax, %cx # CX=number of characters
addw %ax, %ax # Calculate image size
- addw $modelist+1024+4, %ax
+ addw heap_start, %ax
+ addw $4, %ax
cmpw heap_end_ptr, %ax
jnc sts1 # Unfortunately, out of memory

movw %fs:(PARAM_CURSOR_POS), %ax # Store mode params
- leaw modelist+1024, %di
+ movw heap_start, %di
stosw
movw %bx, %ax
stosw
@@ -802,7 +809,7 @@
call mode_params # Get parameters of current mode
movb %fs:(PARAM_VIDEO_LINES), %cl
movb %fs:(PARAM_VIDEO_COLS), %ch
- leaw modelist+1024, %si # Screen buffer
+ movw heap_start, %si # Screen buffer
lodsw # Set cursor position
movw %ax, %dx
cmpb %cl, %dh
@@ -883,7 +890,8 @@
orw %di, %di
jnz mtab1x

- leaw modelist, %di # Store standard modes:
+ movw heap_start, %di # Store standard modes:
+ movw %di, modelist
movl $VIDEO_80x25 + 0x50190000, %eax # The 80x25 mode (ALL)
stosl
movb adapter, %al # CGA/MDA/HGA -- no more modes
@@ -929,13 +937,13 @@
mtabe:

#ifdef CONFIG_VIDEO_COMPACT
- leaw modelist, %si
+ movw modelist, %si
movw %di, %dx
movw %si, %di
cmt1: cmpw %dx, %si # Scan all modes
jz cmt2

- leaw modelist, %bx # Find in previous entries
+ movw modelist, %bx # Find in previous entries
movw 2(%si), %cx
cmt3: cmpw %bx, %si
jz cmt4
@@ -957,7 +965,8 @@

movw $ASK_VGA, (%di) # End marker
movw %di, mt_end
-mtab1: leaw modelist, %si # SI=mode list, DI=list end
+ movw %di, heap_start
+mtab1: movw modelist, %si # SI=mode list, DI=list end
ret0: ret

# Modes usable on all standard VGAs
@@ -1932,3 +1941,5 @@
adapter: .byte 0 # Video adapter: 0=CGA/MDA/HGA,1=EGA,2=VGA
video_segment: .word 0xb800 # Video memory segment
force_size: .word 0 # Use this size instead of the one in BIOS vars
+modelist: .word 0 # Start of modelist on the heap
+heap_start: .word 0 # low heap address
diff -uNr linux-2.5.12.boot.syntax/include/asm-i386/boot.h linux-2.5.12.boot.heap/include/asm-i386/boot.h
--- linux-2.5.12.boot.syntax/include/asm-i386/boot.h Wed May 1 09:39:11 2002
+++ linux-2.5.12.boot.heap/include/asm-i386/boot.h Wed May 1 09:39:29 2002
@@ -19,6 +19,7 @@
#define DEF_SYSSEG 0x1000
#define DEF_SETUPSEG 0x9020
#define DEF_SYSSIZE 0x7F00
+#define DEF_HEAP_SIZE 1024

/* Internal svga startup constants */
#define NORMAL_VGA 0xffff /* 80x25 mode */
diff -uNr linux-2.5.12.boot.syntax/include/asm-i386/boot_param.h linux-2.5.12.boot.heap/include/asm-i386/boot_param.h
--- linux-2.5.12.boot.syntax/include/asm-i386/boot_param.h Wed May 1 09:38:30 2002
+++ linux-2.5.12.boot.heap/include/asm-i386/boot_param.h Wed May 1 09:39:29 2002
@@ -72,7 +72,9 @@
__u32 cmd_line_ptr; /* 0x228 */
/* 2.03+ */
__u32 ramdisk_max; /* 0x22c */
- __u8 reserved15[0x2d0 - 0x230]; /* 0x230 */
+ /* Below this point for internal kernel use only */
+ __u32 real_filesz; /* 0x230 */
+ __u8 reserved15[0x2d0 - 0x234]; /* 0x234 */
struct e820entry e820_map[E820MAX]; /* 0x2d0 */
/* 0x550 */
} __attribute__((packed));
-
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