Module Name: src
Committed By: maxv
Date: Sun Dec 4 08:21:08 UTC 2016
Modified Files:
src/sys/arch/i386/stand/lib: biosmem.S biosmemps2.S biosmemx.S exec.c
multiboot.S startprog.S
Log Message:
KNF and explain a few things
To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 src/sys/arch/i386/stand/lib/biosmem.S \
src/sys/arch/i386/stand/lib/biosmemx.S
cvs rdiff -u -r1.6 -r1.7 src/sys/arch/i386/stand/lib/biosmemps2.S
cvs rdiff -u -r1.61 -r1.62 src/sys/arch/i386/stand/lib/exec.c
cvs rdiff -u -r1.1 -r1.2 src/sys/arch/i386/stand/lib/multiboot.S
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/i386/stand/lib/startprog.S
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/i386/stand/lib/biosmem.S
diff -u src/sys/arch/i386/stand/lib/biosmem.S:1.9 src/sys/arch/i386/stand/lib/biosmem.S:1.10
--- src/sys/arch/i386/stand/lib/biosmem.S:1.9 Thu Jun 16 13:27:59 2011
+++ src/sys/arch/i386/stand/lib/biosmem.S Sun Dec 4 08:21:08 2016
@@ -1,4 +1,4 @@
-/* $NetBSD: biosmem.S,v 1.9 2011/06/16 13:27:59 joerg Exp $ */
+/* $NetBSD: biosmem.S,v 1.10 2016/12/04 08:21:08 maxv Exp $ */
/*
* Copyright (c) 1996
@@ -36,8 +36,9 @@
.text
-/* get mem below 1M, in kByte */
-
+/*
+ * Get mem below 1M, in kByte.
+ */
ENTRY(getbasemem)
pusha
@@ -45,18 +46,19 @@ ENTRY(getbasemem)
.code16
int $0x12
- # zero-extend 16-bit result to 32 bits.
- movzwl %ax, %eax
+ /* Zero-extend 16-bit result to 32 bits */
+ movzwl %ax,%eax
calll _C_LABEL(real_to_prot)
.code32
- movl %eax, 28(%esp)
+ movl %eax,28(%esp)
popa
ret
-/* get mem above 1M, in kByte */
-
+/*
+ * Get mem above 1M, in kByte.
+ */
ENTRY(getextmem1)
pusha
@@ -66,13 +68,13 @@ ENTRY(getextmem1)
movb $0x88,%ah
int $0x15
- # zero-extend 16-bit result to 32 bits.
- movzwl %ax, %eax
+ /* Zero-extend 16-bit result to 32 bits */
+ movzwl %ax,%eax
calll _C_LABEL(real_to_prot)
.code32
- movl %eax, 28(%esp)
+ movl %eax,28(%esp)
popa
ret
Index: src/sys/arch/i386/stand/lib/biosmemx.S
diff -u src/sys/arch/i386/stand/lib/biosmemx.S:1.9 src/sys/arch/i386/stand/lib/biosmemx.S:1.10
--- src/sys/arch/i386/stand/lib/biosmemx.S:1.9 Tue Oct 14 14:18:11 2008
+++ src/sys/arch/i386/stand/lib/biosmemx.S Sun Dec 4 08:21:08 2016
@@ -1,4 +1,4 @@
-/* $NetBSD: biosmemx.S,v 1.9 2008/10/14 14:18:11 ad Exp $ */
+/* $NetBSD: biosmemx.S,v 1.10 2016/12/04 08:21:08 maxv Exp $ */
/*
* Copyright (c) 1997, 1999
@@ -30,11 +30,13 @@
.text
-/* int getextmem2(int buffer[2])
- return: 0=OK, -1=error
- buffer[0]: extmem kBytes below 16M (max 15M/1024)
- buffer[1]: extmem above 16M, in 64k units
-*/
+/*
+ * int getextmem2(int buffer[2])
+ *
+ * return: 0=OK, -1=error
+ * buffer[0]: extmem kBytes below 16M (max 15M/1024)
+ * buffer[1]: extmem above 16M, in 64k units
+ */
ENTRY(getextmem2)
pushl %ebp
movl %esp,%ebp
@@ -47,16 +49,16 @@ ENTRY(getextmem2)
call _C_LABEL(prot_to_real)
.code16
- xorl %ebx, %ebx
- movl $0xe801, %eax
+ xorl %ebx,%ebx
+ movl $0xe801,%eax
int $0x15
pushf
- movw %si, %ax
- orw %si, %bx
+ movw %si,%ax
+ orw %si,%bx
jz 1f /* if zero use configured values */
- movw %cx, %ax /* k below 16M (max 0x3c00 = 15MB) */
- movw %dx, %bx /* 64k above 16M */
+ movw %cx,%ax /* k below 16M (max 0x3c00 = 15MB) */
+ movw %dx,%bx /* 64k above 16M */
1:
popf
setc %bl
@@ -64,13 +66,13 @@ ENTRY(getextmem2)
calll _C_LABEL(real_to_prot)
.code32
- movl 8(%ebp), %edi
- xorl %eax, %eax
- movw %cx, %ax
+ movl 8(%ebp),%edi
+ xorl %eax,%eax
+ movw %cx,%ax
stosl
- movw %dx, %ax
+ movw %dx,%ax
stosl
- movb %bl, %al
+ movb %bl,%al
cbw
pop %edi
@@ -81,12 +83,14 @@ ENTRY(getextmem2)
popl %ebp
ret
-/* int getmementry(int *iterator, buffer[5])
- return: 0=ok, else error
- buffer[0]: start of memory chunk
- buffer[2]: length (bytes)
- buffer[4]: type
-*/
+/*
+ * int getmementry(int *iterator, int buffer[5])
+ *
+ * return: 0=ok, else error
+ * buffer[0]: start of memory chunk
+ * buffer[2]: length (bytes)
+ * buffer[4]: type
+ */
ENTRY(getmementry)
pushl %ebp
movl %esp,%ebp
@@ -96,24 +100,24 @@ ENTRY(getmementry)
push %esi
push %edi
- movl 8(%ebp), %eax
- movl 0(%eax), %ebx /* index */
- movl $20, %ecx /* Buffer size */
- movl $0x534d4150, %edx /* "SMAP" */
- movl 12(%ebp), %edi /* buffer address */
+ movl 8(%ebp),%eax
+ movl 0(%eax),%ebx /* index */
+ movl $20,%ecx /* Buffer size */
+ movl $0x534d4150,%edx /* "SMAP" */
+ movl 12(%ebp),%edi /* buffer address */
call _C_LABEL(prot_to_real)
.code16
push %di
- shrl $4, %edi
- mov %ds, %ax
- add %di, %ax
- mov %ax, %es
+ shrl $4,%edi
+ mov %ds,%ax
+ add %di,%ax
+ mov %ax,%es
pop %di
- and $0xf, %di /* buffer addres now in ES:DI */
+ and $0xf,%di /* buffer addres now in ES:DI */
- movl $0xe820, %eax /* Some BIOS check EAX value */
+ movl $0xe820,%eax /* Some BIOS check EAX value */
int $0x15
setc %cl
@@ -121,10 +125,10 @@ ENTRY(getmementry)
calll _C_LABEL(real_to_prot)
.code32
- movl 8(%ebp), %eax
- movl %ebx, 0(%eax) /* updated index */
- xorl %eax, %eax
- movb %cl, %al
+ movl 8(%ebp),%eax
+ movl %ebx,0(%eax) /* updated index */
+ xorl %eax,%eax
+ movb %cl,%al
pop %edi
pop %esi
@@ -134,9 +138,11 @@ ENTRY(getmementry)
popl %ebp
ret
-/* int biosA20(void)
- return: 0=ok, else error
-*/
+/*
+ * int biosA20(void)
+ *
+ * return: 0=ok, else error
+ */
ENTRY(biosA20)
pushl %ebp
movl %esp,%ebp
@@ -149,14 +155,14 @@ ENTRY(biosA20)
call _C_LABEL(prot_to_real)
.code16
- movl $0x2401, %eax
+ movl $0x2401,%eax
int $0x15
setc %cl
calll _C_LABEL(real_to_prot)
.code32
- movzbl %cl, %eax
+ movzbl %cl,%eax
pop %edi
pop %esi
Index: src/sys/arch/i386/stand/lib/biosmemps2.S
diff -u src/sys/arch/i386/stand/lib/biosmemps2.S:1.6 src/sys/arch/i386/stand/lib/biosmemps2.S:1.7
--- src/sys/arch/i386/stand/lib/biosmemps2.S:1.6 Thu Jun 16 13:27:59 2011
+++ src/sys/arch/i386/stand/lib/biosmemps2.S Sun Dec 4 08:21:08 2016
@@ -1,6 +1,6 @@
-/* $NetBSD: biosmemps2.S,v 1.6 2011/06/16 13:27:59 joerg Exp $ */
+/* $NetBSD: biosmemps2.S,v 1.7 2016/12/04 08:21:08 maxv Exp $ */
-/*-
+/*
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
@@ -33,55 +33,58 @@
.text
-/* int getextmemp2(void buffer)
- call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION
- return: 0=OK, nonzero=error
- buffer: filled with memory-map table structure
-*/
+/*
+ * int getextmemps2(void *buffer)
+ *
+ * call int 15 function 0xc7 - later PS/2s - RETURN MEMORY-MAP INFORMATION
+ * return: 0=OK, nonzero=error
+ * buffer: filled with memory-map table structure
+ */
ENTRY(getextmemps2)
.code32
- movl %eax, %edx
- xorl %eax, %eax
+ movl %eax,%edx
+ xorl %eax,%eax
pusha
call _C_LABEL(prot_to_real)
.code16
- # do int15, function 0xc0 call to discover if C7h is supported
- movb $0xc0, %ah
+ /* do int15, function 0xc0 call to discover if C7h is supported */
+ movb $0xc0,%ah
int $0x15
setc %cl
- jc out # 0xc0 not supported if carry set
+ jc out /* 0xc0 not supported if carry set */
- # check feature byte 2, bit 4 to see if return memory map is supported
- movb %es:6(%bx), %al
- andb $0x10, %al
- jnz getmem # 0xc7 supported
-
- # set %cl to indicate failure, and exit
- movb $2, %cl
+ /* check feature byte 2, bit 4 to see if return memory map is supported */
+ movb %es:6(%bx),%al
+ andb $0x10,%al
+ jnz getmem /* 0xc7 supported */
+
+ /* set %cl to indicate failure, and exit */
+ movb $2,%cl
jmp out
getmem:
- # move the parameter to right register
+ /* move the parameter to right register */
push %ds
- movl %edx, %esi
- andl $0xf, %esi
- shrl $4, %edx
- mov %ds, %ax
- add %dx, %ax
- mov %ax, %ds
+ movl %edx,%esi
+ andl $0xf,%esi
+ shrl $4,%edx
+ mov %ds,%ax
+ add %dx,%ax
+ mov %ax,%ds
- # actually call int15, function 0xc7 now
- movb $0xc7, %ah
+ /* actually call int15, function 0xc7 now */
+ movb $0xc7,%ah
int $0x15
- setc %cl # save carry
+ setc %cl /* save carry */
pop %ds
out:
calll _C_LABEL(real_to_prot)
.code32
- movb %cl, 28(%esp)
+ movb %cl,28(%esp)
popa
ret
+
Index: src/sys/arch/i386/stand/lib/exec.c
diff -u src/sys/arch/i386/stand/lib/exec.c:1.61 src/sys/arch/i386/stand/lib/exec.c:1.62
--- src/sys/arch/i386/stand/lib/exec.c:1.61 Sun Jun 5 14:13:57 2016
+++ src/sys/arch/i386/stand/lib/exec.c Sun Dec 4 08:21:08 2016
@@ -1,6 +1,6 @@
-/* $NetBSD: exec.c,v 1.61 2016/06/05 14:13:57 maxv Exp $ */
+/* $NetBSD: exec.c,v 1.62 2016/12/04 08:21:08 maxv Exp $ */
-/*-
+/*
* Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
@@ -88,8 +88,7 @@
*/
/*
- * starts NetBSD a.out kernel
- * needs lowlevel startup from startprog.S
+ * Starts a NetBSD ELF kernel. The low level startup is done in startprog.S.
* This is a special version of exec.c to support use of XMS.
*/
@@ -260,8 +259,8 @@ common_load_kernel(const char *file, u_l
{
int fd;
#ifdef XMS
- u_long xmsmem;
- physaddr_t origaddr = loadaddr;
+ u_long xmsmem;
+ physaddr_t origaddr = loadaddr;
#endif
*extmem = getextmem();
@@ -269,14 +268,14 @@ common_load_kernel(const char *file, u_l
#ifdef XMS
if ((getextmem1() == 0) && (xmsmem = checkxms())) {
- u_long kernsize;
+ u_long kernsize;
/*
* With "CONSERVATIVE_MEMDETECT", extmem is 0 because
- * getextmem() is getextmem1(). Without, the "smart"
- * methods could fail to report all memory as well.
+ * getextmem() is getextmem1(). Without, the "smart"
+ * methods could fail to report all memory as well.
* xmsmem is a few kB less than the actual size, but
- * better than nothing.
+ * better than nothing.
*/
if (xmsmem > *extmem)
*extmem = xmsmem;
@@ -343,17 +342,17 @@ common_load_kernel(const char *file, u_l
int
exec_netbsd(const char *file, physaddr_t loadaddr, int boothowto, int floppy,
- void (*callback)(void))
+ void (*callback)(void))
{
- uint32_t boot_argv[BOOT_NARGS];
- u_long marks[MARK_MAX];
+ uint32_t boot_argv[BOOT_NARGS];
+ u_long marks[MARK_MAX];
struct btinfo_symtab btinfo_symtab;
- u_long extmem;
- u_long basemem;
+ u_long extmem;
+ u_long basemem;
#ifdef DEBUG
- printf("exec: file=%s loadaddr=0x%lx\n",
- file ? file : "NULL", loadaddr);
+ printf("exec: file=%s loadaddr=0x%lx\n", file ? file : "NULL",
+ loadaddr);
#endif
BI_ALLOC(BTINFO_MAX);
@@ -406,7 +405,7 @@ exec_netbsd(const char *file, physaddr_t
if (callback != NULL)
(*callback)();
startprog(marks[MARK_ENTRY], BOOT_NARGS, boot_argv,
- x86_trunc_page(basemem*1024));
+ x86_trunc_page(basemem * 1024));
panic("exec returned");
out:
@@ -670,11 +669,11 @@ exec_multiboot(const char *file, char *a
struct multiboot_info *mbi;
struct multiboot_module *mbm;
struct bi_modulelist_entry *bim;
- int i, len;
- u_long marks[MARK_MAX];
- u_long extmem;
- u_long basemem;
- char *cmdline;
+ int i, len;
+ u_long marks[MARK_MAX];
+ u_long extmem;
+ u_long basemem;
+ char *cmdline;
mbi = alloc(sizeof(struct multiboot_info));
mbi->mi_flags = MULTIBOOT_INFO_HAS_MEMORY;
@@ -721,7 +720,6 @@ exec_multiboot(const char *file, char *a
marks[MARK_NSYM], marks[MARK_SYM], marks[MARK_END]);
#endif
-
#if 0
if (btinfo_symtab.nsym) {
mbi->mi_flags |= MULTIBOOT_INFO_HAS_ELF_SYMS;
@@ -732,11 +730,11 @@ exec_multiboot(const char *file, char *a
#endif
multiboot(marks[MARK_ENTRY], vtophys(mbi),
- x86_trunc_page(mbi->mi_mem_lower*1024));
+ x86_trunc_page(mbi->mi_mem_lower * 1024));
panic("exec returned");
out:
- dealloc(mbi, 0);
+ dealloc(mbi, 0);
return -1;
}
Index: src/sys/arch/i386/stand/lib/multiboot.S
diff -u src/sys/arch/i386/stand/lib/multiboot.S:1.1 src/sys/arch/i386/stand/lib/multiboot.S:1.2
--- src/sys/arch/i386/stand/lib/multiboot.S:1.1 Sat Oct 11 11:06:20 2008
+++ src/sys/arch/i386/stand/lib/multiboot.S Sun Dec 4 08:21:08 2016
@@ -1,13 +1,6 @@
-/* $NetBSD: multiboot.S,v 1.1 2008/10/11 11:06:20 joerg Exp $ */
-
-/* starts program in protected mode / flat space
- with given stackframe
- needs global variables flatcodeseg and flatdataseg
- (gdt offsets)
- derived from: NetBSD:sys/arch/i386/stand/lib/startprog.S
- */
+/* $NetBSD: multiboot.S,v 1.2 2016/12/04 08:21:08 maxv Exp $ */
-/*-
+/*
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
@@ -62,63 +55,71 @@
*/
/*
- Copyright 1988, 1989, 1990, 1991, 1992
- by Intel Corporation, Santa Clara, California.
-
- All Rights Reserved
-
-Permission to use, copy, modify, and distribute this software and
-its documentation for any purpose and without fee is hereby
-granted, provided that the above copyright notice appears in all
-copies and that both the copyright notice and this permission notice
-appear in supporting documentation, and that the name of Intel
-not be used in advertising or publicity pertaining to distribution
-of the software without specific, written prior permission.
-
-INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
-INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
-IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
-CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
-LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
-NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
-WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
+ * Copyright 1988, 1989, 1990, 1991, 1992
+ * by Intel Corporation, Santa Clara, California.
+ *
+ * All Rights Reserved
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that the above copyright notice appears in all
+ * copies and that both the copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of Intel
+ * not be used in advertising or publicity pertaining to distribution
+ * of the software without specific, written prior permission.
+ *
+ * INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+ * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+ * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
#include <machine/asm.h>
#define MULTIBOOT_INFO_MAGIC 0x2BADB002
/*
- * multiboot(phyaddr,header,stack)
+ * Starts program in protected mode / flat space with given stackframe.
+ * Needs global variables flatcodeseg and flatdataseg (gdt offsets).
+ * Derived from: NetBSD:sys/arch/i386/stand/lib/startprog.S
+ */
+
+/*
+ * multiboot(phyaddr, header, stack)
* start the program on protected mode where phyaddr is the entry point
*/
ENTRY(multiboot)
pushl %ebp
- movl %esp, %ebp
+ movl %esp,%ebp
- # prepare a new stack
- movl $flatdataseg, %eax
- movw %ax, %es # for arg copy
- movl 16(%ebp), %ebx # stack
+ /* Prepare a new stack */
+ movl $flatdataseg,%eax
+ movw %ax,%es /* for arg copy */
+ movl 16(%ebp),%ebx /* stack */
subl $4,%ebx
- movl %ebx, %edi
+ movl %ebx,%edi
+
+ movl 12(%ebp),%ebx /* header */
+ movl 8(%ebp),%ecx /* entry */
- movl 12(%ebp), %ebx # header
- movl 8(%ebp), %ecx # entry
+ /* Set new stack pointer */
+ movw %ax,%ss
+ movl %edi,%esp
- # set new stackptr (movsl decd sp 1 more -> dummy return address)
- movw %ax, %ss
- movl %edi, %esp
-
- # push on our entry address
- movl $flatcodeseg, %eax # segment
- pushl %eax
- pushl %ecx #entry
-
- # convert over the other data segs
- movl $flatdataseg, %eax
- mov %ax, %ds
- mov %ax, %es
+ /* Push on our entry address */
+ movl $flatcodeseg,%eax
+ pushl %eax /* code segment */
+ pushl %ecx /* phyaddr */
- movl $MULTIBOOT_INFO_MAGIC, %eax
- # convert the PC (and code seg)
+ /* Convert over the other data segs */
+ movl $flatdataseg,%eax
+ mov %ax,%ds
+ mov %ax,%es
+
+ movl $MULTIBOOT_INFO_MAGIC,%eax
+
+ /* Jump to phyaddr, with the new code segment */
lret
+
Index: src/sys/arch/i386/stand/lib/startprog.S
diff -u src/sys/arch/i386/stand/lib/startprog.S:1.3 src/sys/arch/i386/stand/lib/startprog.S:1.4
--- src/sys/arch/i386/stand/lib/startprog.S:1.3 Sat Feb 1 14:48:18 2003
+++ src/sys/arch/i386/stand/lib/startprog.S Sun Dec 4 08:21:08 2016
@@ -1,11 +1,4 @@
-/* $NetBSD: startprog.S,v 1.3 2003/02/01 14:48:18 dsl Exp $ */
-
-/* starts program in protected mode / flat space
- with given stackframe
- needs global variables flatcodeseg and flatdataseg
- (gdt offsets)
- derived from: NetBSD:sys/arch/i386/boot/asm.S
- */
+/* $NetBSD: startprog.S,v 1.4 2016/12/04 08:21:08 maxv Exp $ */
/*
* Ported to boot 386BSD by Julian Elischer ([email protected]) Sept 1992
@@ -36,75 +29,80 @@
*/
/*
- Copyright 1988, 1989, 1990, 1991, 1992
- by Intel Corporation, Santa Clara, California.
-
- All Rights Reserved
-
-Permission to use, copy, modify, and distribute this software and
-its documentation for any purpose and without fee is hereby
-granted, provided that the above copyright notice appears in all
-copies and that both the copyright notice and this permission notice
-appear in supporting documentation, and that the name of Intel
-not be used in advertising or publicity pertaining to distribution
-of the software without specific, written prior permission.
-
-INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
-INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
-IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
-CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
-LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
-NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
-WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
+ * Copyright 1988, 1989, 1990, 1991, 1992
+ * by Intel Corporation, Santa Clara, California.
+ *
+ * All Rights Reserved
+ *
+ * Permission to use, copy, modify, and distribute this software and
+ * its documentation for any purpose and without fee is hereby
+ * granted, provided that the above copyright notice appears in all
+ * copies and that both the copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of Intel
+ * not be used in advertising or publicity pertaining to distribution
+ * of the software without specific, written prior permission.
+ *
+ * INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+ * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+ * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
#include <machine/asm.h>
/*
- * startprog(phyaddr,argc,argv,stack)
+ * Starts program in protected mode / flat space with given stackframe.
+ * Needs global variables flatcodeseg and flatdataseg (gdt offsets).
+ */
+
+/*
+ * startprog(phyaddr, argc, argv, stack)
* start the program on protected mode where phyaddr is the entry point
*/
ENTRY(startprog)
pushl %ebp
- movl %esp, %ebp
+ movl %esp,%ebp
- # prepare a new stack
- movl $flatdataseg, %ebx
- movw %bx, %es # for arg copy
- movl 20(%ebp), %eax # stack
+ /* Prepare a new stack */
+ movl $flatdataseg,%ebx
+ movw %bx,%es /* for arg copy */
+ movl 20(%ebp),%eax /* stack */
subl $4,%eax
- movl %eax, %edi
-
- # push some number of args onto the stack
- movl 12(%ebp), %ecx # argc
+ movl %eax,%edi
- movl %ecx, %eax
+ /* Push some number of args onto the stack */
+ movl 12(%ebp),%ecx /* argc */
+ movl %ecx,%eax
decl %eax
- shl $2, %eax
- addl 16(%ebp), %eax # ptr to last arg
- movl %eax, %esi
+ shl $2,%eax
+ addl 16(%ebp),%eax /* ptr to last arg */
+ movl %eax,%esi
- std # backwards
+ std /* backwards */
rep
- movsl
+ movsl /* copy %ds:(%esi) -> %es:(%edi) */
- cld # LynxOS depends on it
+ cld
- movl 8(%ebp), %ecx # entry
+ movl 8(%ebp),%ecx /* entry */
- # set new stackptr (movsl decd sp 1 more -> dummy return address)
- movw %bx, %ss
- movl %edi, %esp
+ /* Set new stack pointer (movsl decd sp 1 more -> dummy return address) */
+ movw %bx,%ss
+ movl %edi,%esp
- # push on our entry address
- movl $flatcodeseg, %ebx # segment
- pushl %ebx
- pushl %ecx #entry
+ /* Push on our entry address */
+ movl $flatcodeseg,%ebx
+ pushl %ebx /* code segment */
+ pushl %ecx /* phyaddr */
- # convert over the other data segs
- movl $flatdataseg, %ebx
- mov %bx, %ds
- mov %bx, %es
+ /* Convert over the other data segs */
+ movl $flatdataseg,%ebx
+ mov %bx,%ds
+ mov %bx,%es
- # convert the PC (and code seg)
+ /* Jump to phyaddr, with the new code segment */
lret
+
