CHECKPATCH: arch/x86/lib/*

arch/x86/lib/bios.S

@@ -246,11 +246,9 @@ rm_int1f:
 rm_def_int:
 	iret
 
-
 	/*
-	 * All interrupt jumptable entries jump to here
+	 * All interrupt jumptable entries jump to here after pushing the
-	 * after pushing the interrupt vector number onto the
+	 * interrupt vector number onto the stack.
-	 * stack.
 	 */
 any_interrupt16:
 	MAKE_BIOS_STACK
@@ -272,7 +270,8 @@ gs	movw	OFFS_VECTOR(%bp), %ax
 	je	Lint_1ah
 	movw	$0xffff, %ax
 	jmp	Lout
-Lint_10h:					/* VGA BIOS services */
+Lint_10h:
+	/* VGA BIOS services */
 	call	bios_10h
 	jmp	Lout
 Lint_11h:
@@ -281,35 +280,42 @@ Lint_11h:
 Lint_12h:
 	call	bios_12h
 	jmp	Lout
-Lint_13h:					/* BIOS disk services */
+Lint_13h:
+	/* BIOS disk services */
 	call	bios_13h
 	jmp	Lout
-Lint_15h:					/* Misc. BIOS services */
+Lint_15h:
+	/* Misc. BIOS services */
 	call	bios_15h
 	jmp	Lout
-Lint_16h:					/* keyboard services */
+Lint_16h:
+	/* keyboard services */
 	call	bios_16h
 	jmp	Lout
-Lint_1ah:					/* PCI bios */
+Lint_1ah:
+	/* PCI bios */
 	call	bios_1ah
 	jmp	Lout
 Lout:
 	cmpw	$0, %ax
 	je	Lhandeled
 
-	/* Insert code for unhandeled INTs here.
+	/*
+	 * Insert code for unhandeled INTs here.
 	 *
-	 * ROLO prints a message to the console
+	 * ROLO prints a message to the console we could do that but then
-	 * (we could do that but then we're in 16bit mode
+	 * we're in 16bit mode so we'll have to get back into 32bit mode
-	 * so we'll have to get back into 32bit mode
+	 * to use the console I/O routines (if we do this we should make
-	 * to use the console I/O routines (if we do this
+	 * int 0x10 and int 0x16 work as well)
-	 * we shuls make int 0x10 and int 0x16 work as well))
 	 */
 Lhandeled:
 	RESTORE_CALLERS_STACK
-	addw	$2,%sp				/* dump vector number */
-	iret					/* return from interrupt */
 
+	/* dump vector number */
+	addw	$2,%sp
+
+	/* return from interrupt */
+	iret
 
 /*
  ************************************************************
@@ -327,22 +333,24 @@ gs	movw	OFFS_AX(%bp), %ax
 	je	Lvid_cfg
 	movw	$0xffff, %ax
 	ret
-Lcur_pos:					/* Read Cursor Position and Size */
+Lcur_pos:
+	/* Read Cursor Position and Size */
 gs	movw	$0, OFFS_CX(%bp)
 gs	movw	$0, OFFS_DX(%bp)
 	xorw	%ax, %ax
 	ret
-Lvid_state:					/* Get Video State */
+Lvid_state:
-gs	movw	$(80 << 8|0x03), OFFS_AX(%bp)	/* 80 columns, 80x25, 16 colors */
+	/* Get Video State - 80 columns, 80x25, 16 colors */
+gs	movw	$(80 << 8|0x03), OFFS_AX(%bp)
 gs	movw	$0, OFFS_BX(%bp)
 	xorw	%ax, %ax
 	ret
-Lvid_cfg:	/* Video Subsystem Configuration (EGA/VGA) */
+Lvid_cfg:
-gs	movw	$0x10, OFFS_BX(%bp)		/* indicate CGA/MDA/HGA */
+	/* Video Subsystem Configuration (EGA/VGA) - indicate CGA/MDA/HGA */
+gs	movw	$0x10, OFFS_BX(%bp)
 	xorw	%ax, %ax
 	ret
 
-
 /*
  ************************************************************
  * BIOS interrupt 11h -- Equipment determination
@@ -355,7 +363,6 @@ gs	movw	%ax, OFFS_AX(%bp)
 	xorw	%ax, %ax
 	ret
 
-
 /*
  ************************************************************
  * BIOS	interrupt 12h -- Get Memory Size
@@ -370,16 +377,18 @@ cs	movw	ram_in_64kb_chunks, %ax
 b12_more_than_640k:
 	movw	$0x280, %ax
 b12_return:
-gs	movw	%ax, OFFS_AX(%bp)		/* return number of kilobytes in ax */
+	/* return number of kilobytes in ax */
+gs	movw	%ax, OFFS_AX(%bp)
 
 gs	movw	OFFS_FLAGS(%bp), %ax
-	andw	$0xfffe, %ax			/* clear carry -- function succeeded */
+
+	/* clear carry -- function succeeded */
+	andw	$0xfffe, %ax
 gs	movw	%ax, OFFS_FLAGS(%bp)
 
 	xorw	%ax, %ax
 	ret
 
-
 /*
  ************************************************************
  * BIOS interrupt 13h -- Disk services
@@ -394,12 +403,13 @@ gs	movw	OFFS_AX(%bp), %ax
 	ret
 Lfunc_15h:
 gs	movw	OFFS_AX(%bp), %ax
-	andw	$0xff, %ax			/* return AH=0->drive not present */
+
+	/* return AH=0->drive not present */
+	andw	$0x00ff, %ax
 gs	movw	%ax, OFFS_AX(%bp)
 	xorw	%ax, %ax
 	ret
 
-
 /*
  ***********************************************************
  * BIOS interrupt 15h -- Miscellaneous services
@@ -417,9 +427,12 @@ gs	movw	OFFS_AX(%bp), %ax
 	movw	$0xffff, %ax
 	ret
 
-Lfunc_c0h:					/* Return System Configuration Parameters (PS2 only) */
+Lfunc_c0h:
+	/* Return System Configuration Parameters (PS2 only) */
 gs	movw	OFFS_FLAGS(%bp), %ax
-	orw	$1, %ax				/* return carry -- function not supported */
+
+	/* return carry -- function not supported */
+	orw	$1, %ax
 gs	movw	%ax, OFFS_FLAGS(%bp)
 	xorw	%ax, %ax
 	ret
@@ -430,38 +443,56 @@ gs	movw	OFFS_AX(%bp), %ax
 	cmpw	$1, %ax
 	je	Lfunc_e801h
 gs	movw	OFFS_FLAGS(%bp), %ax
-	orw	$1, %ax				/* return carry -- function not supported */
+
+	/* return carry -- function not supported */
+	orw	$1, %ax
 gs	movw	%ax, OFFS_FLAGS(%bp)
 	xorw	%ax, %ax
 	ret
 
-Lfunc_e801h:					/* Get memory size for >64M Configurations */
+Lfunc_e801h:
+	/* Get memory size for >64M Configurations */
 cs	movw	ram_in_64kb_chunks, %ax
 	cmpw	$0x100, %ax
 	ja	e801_more_than_16mb
-	shlw	$6, %ax				/* multiply by 64 */
-	subw	$0x400, %ax			/* 1st meg does not count */
 
-gs	movw	%ax, OFFS_AX(%bp)		/* return memory size between 1M and 16M in 1kb chunks in AX and CX */
+	/* multiply by 64 */
+	shlw	$6, %ax
+
+	/* 1st meg does not count */
+	subw	$0x400, %ax
+
+	/* return memory size between 1M and 16M in 1kb chunks in AX and CX */
+gs	movw	%ax, OFFS_AX(%bp)
 gs	movw	%ax, OFFS_CX(%bp)
-gs	movw	$0, OFFS_BX(%bp)		/* set BX and DX to 0*/
+
+	/* set BX and DX to 0*/
+gs	movw	$0, OFFS_BX(%bp)
 gs	movw	$0, OFFS_DX(%bp)
 gs	movw	OFFS_FLAGS(%bp), %ax
-	andw	$0xfffe, %ax			/* clear carry -- function succeeded */
+
+	/* clear carry -- function succeeded */
+	andw	$0xfffe, %ax
 gs	movw	%ax, OFFS_FLAGS(%bp)
 	xorw	%ax, %ax
 	ret
 
 e801_more_than_16mb:
-	subw	$0x100, %ax			/* subtract 16MB */
+	/* subtract 16MB */
+	subw	$0x100, %ax
 
-gs	movw	$0x3c00, OFFS_AX(%bp)		/* return 0x3c00 (16MB-1MB) in AX and CX */
+	/* return 0x3c00 (16MB-1MB) in AX and CX */
+gs	movw	$0x3c00, OFFS_AX(%bp)
 gs	movw	$0x3c00, OFFS_CX(%bp)
-gs	movw	%ax, OFFS_BX(%bp)		/* set BX and DX to number of 64kb chunks above 16MB */
+
+	/* set BX and DX to number of 64kb chunks above 16MB */
+gs	movw	%ax, OFFS_BX(%bp)
 gs	movw	%ax, OFFS_DX(%bp)
 
 gs	movw	OFFS_FLAGS(%bp), %ax
-	andw	$0xfffe, %ax			/* clear carry -- function succeeded */
+
+	/* clear carry -- function succeeded */
+	andw	$0xfffe, %ax
 gs	movw	%ax, OFFS_FLAGS(%bp)
 	xorw	%ax, %ax
 	ret
@@ -473,18 +504,22 @@ cs	movw	ram_in_64kb_chunks, %ax
 	movw	$0x100, %ax
 b88_not_more_than16:
 	shlw	$6, %ax
-	subw	$0x400, %ax			/* 1st meg does not count */
 
-gs	movw	%ax, OFFS_AX(%bp)		/* return number of kilobytes between 16MB and 16MB in ax */
+	/* 1st meg does not count */
+	subw	$0x400, %ax
+
+	/* return number of kilobytes between 16MB and 16MB in ax */
+gs	movw	%ax, OFFS_AX(%bp)
 
 gs	movw	OFFS_FLAGS(%bp), %ax
-	andw	$0xfffe, %ax			/* clear carry -- function succeeded */
+
+	/* clear carry -- function succeeded */
+	andw	$0xfffe, %ax
 gs	movw	%ax, OFFS_FLAGS(%bp)
 
 	xorw	%ax, %ax
 	ret
 
-
 /*
  ************************************************************
  * BIOS interrupt 16h -- keyboard services
@@ -498,7 +533,8 @@ gs	movw	OFFS_AX(%bp), %ax
 	movw	$0xffff, %ax
 	ret
 Lfunc_03h:
-	xorw	%ax, %ax			/* do nothing -- function not supported */
+	/* do nothing -- function not supported */
+	xorw	%ax, %ax
 	ret
 
 /*
@@ -514,7 +550,9 @@ gs	movw	OFFS_AX(%bp), %ax
 	ret
 Lfunc_b1h:
 	call	realmode_pci_bios
-	xorw	%ax, %ax			/* do nothing -- function not supported */
+
+	/* do nothing -- function not supported */
+	xorw	%ax, %ax
 	ret
 
 

arch/x86/lib/realmode_switch.S

@@ -49,6 +49,7 @@
 
 .section .realmode, "ax"
 .code16
+
 	/* 16bit protected mode code here */
 .globl realmode_enter
 realmode_enter:
@@ -69,12 +70,16 @@ o32	pushf
 	movw	%ax, %gs
 
 	lidt	realmode_idt_ptr
-	movl	%cr0, %eax			/* Go back into real mode by */
+	/* Go back into real mode by clearing PE to 0 */
-	andl	$0x7ffffffe, %eax		/* clearing PE to 0 */
+	movl	%cr0, %eax
+	andl	$0x7ffffffe, %eax
 	movl	%eax, %cr0
-	ljmp	$0x0,$do_realmode		/* switch to real mode */
 
-do_realmode:					/* realmode code from here */
+	/* switch to real mode */
+	ljmp	$0x0,$do_realmode
+
+do_realmode:
+	/* realmode code from here */
 	movw	%cs,%ax
 	movw	%ax,%ds
 	movw	%ax,%es
@@ -82,7 +87,6 @@ do_realmode:					/* realmode code from here */
 	movw	%ax,%gs
 
 	/* create a temporary stack */
-
 	movw	$0xc0, %ax
 	movw	%ax, %ss
 	movw	$0x200, %ax
@@ -114,14 +118,16 @@ o32	popf
 	popw	%ss
 	movl	%eax, %esp
 cs	movl	temp_eax, %eax
-	wbinvd					/* self-modifying code,
+
-						 * better flush the cache */
+	/* self-modifying code, better flush the cache */
+	wbinvd
 
 	.byte	0x9a				/* lcall */
 temp_ip:
 	.word	0				/* new ip */
 temp_cs:
 	.word	0				/* new cs */
+
 realmode_ret:
 	/* save eax, esp and ss */
 cs	movl	%eax, saved_eax
@@ -130,10 +136,11 @@ cs	movl	%eax, saved_esp
 	movw	%ss, %ax
 cs	movw	%ax, saved_ss
 
-	/* restore the stack, note that we set sp to 0x244;
+	/*
+	 * restore the stack, note that we set sp to 0x244;
 	 * pt_regs is 0x44 bytes long and we push the structure
-	 * backwards on to the stack, bottom first */
+	 * backwards on to the stack, bottom first
-
+	 */
 	movw	$0xc0, %ax
 	movw	%ax, %ss
 	movw	$0x244, %ax
@@ -169,12 +176,15 @@ cs	movw	temp_ip, %ax
 	pushl	%ebx
 
 o32 cs	lidt	saved_idt
-o32 cs	lgdt	saved_gdt			/* Set GDTR */
+o32 cs	lgdt	saved_gdt
 
-	movl	%cr0, %eax			/* Go back into protected mode */
+	/* Go back into protected mode reset PE to 1 */
-	orl	$1,%eax	/* reset PE to 1 */
+	movl	%cr0, %eax
+	orl	$1,%eax
 	movl	%eax, %cr0
-	jmp	next_line			/* flush prefetch queue */
+
+	/* flush prefetch queue */
+	jmp	next_line
 next_line:
 	movw	$return_ptr, %ax
 	movw	%ax,%bp
@@ -182,12 +192,13 @@ o32 cs	ljmp	*(%bp)
 
 .code32
 protected_mode:
-	movl	$0x18,%eax			/* reload GDT[3] */
+	/* Reload segment registers */
-	movw	%ax,%fs				/* reset FS */
+	movl	$0x18, %eax
-	movw	%ax,%ds				/* reset DS */
+	movw	%ax, %fs
-	movw	%ax,%gs				/* reset GS */
+	movw	%ax, %ds
-	movw	%ax,%es				/* reset ES */
+	movw	%ax, %gs
-	movw	%ax,%ss				/* reset SS */
+	movw	%ax, %es
+	movw	%ax, %ss
 	movl	saved_protected_mode_esp, %eax
 	movl	%eax, %esp
 	popf