Merge branch 'x86/setup' into x86/devel

Documentation/i386/boot.txt → Documentation/x86/i386/boot.txt

-		     THE LINUX/I386 BOOT PROTOCOL
-		     ----------------------------
+		     THE LINUX/x86 BOOT PROTOCOL
+		     ---------------------------
 
-		    H. Peter Anvin <hpa@zytor.com>
-			Last update 2007-05-23
-
-On the i386 platform, the Linux kernel uses a rather complicated boot
+On the x86 platform, the Linux kernel uses a rather complicated boot
 convention.  This has evolved partially due to historical aspects, as
 well as the desire in the early days to have the kernel itself be a
 bootable image, the complicated PC memory model and due to changed
 expectations in the PC industry caused by the effective demise of
 real-mode DOS as a mainstream operating system.
 
-Currently, the following versions of the Linux/i386 boot protocol exist.
+Currently, the following versions of the Linux/x86 boot protocol exist.
 
 Old kernels:	zImage/Image support only.  Some very early kernels
 		may not even support a command line.
@@ -372,10 +369,17 @@ Protocol:	2.00+
 	- If 0, the protected-mode code is loaded at 0x10000.
 	- If 1, the protected-mode code is loaded at 0x100000.
 
+  Bit 5 (write): QUIET_FLAG
+	- If 0, print early messages.
+	- If 1, suppress early messages.
+		This requests to the kernel (decompressor and early
+		kernel) to not write early messages that require
+		accessing the display hardware directly.
+
   Bit 6 (write): KEEP_SEGMENTS
 	Protocol: 2.07+
-	- if 0, reload the segment registers in the 32bit entry point.
-	- if 1, do not reload the segment registers in the 32bit entry point.
+	- If 0, reload the segment registers in the 32bit entry point.
+	- If 1, do not reload the segment registers in the 32bit entry point.
 		Assume that %cs %ds %ss %es are all set to flat segments with
 		a base of 0 (or the equivalent for their environment).
 
@@ -504,7 +508,7 @@ Protocol:	2.06+
   maximum size was 255.
 
 Field name:	hardware_subarch
-Type:		write
+Type:		write (optional, defaults to x86/PC)
 Offset/size:	0x23c/4
 Protocol:	2.07+
 
@@ -520,11 +524,13 @@ Protocol:	2.07+
   0x00000002	Xen
 
 Field name:	hardware_subarch_data
-Type:		write
+Type:		write (subarch-dependent)
 Offset/size:	0x240/8
 Protocol:	2.07+
 
   A pointer to data that is specific to hardware subarch
+  This field is currently unused for the default x86/PC environment,
+  do not modify.
 
 Field name:	payload_offset
 Type:		read
@@ -545,6 +551,34 @@ Protocol:	2.08+
 
   The length of the payload.
 
+Field name:	setup_data
+Type:		write (special)
+Offset/size:	0x250/8
+Protocol:	2.09+
+
+  The 64-bit physical pointer to NULL terminated single linked list of
+  struct setup_data. This is used to define a more extensible boot
+  parameters passing mechanism. The definition of struct setup_data is
+  as follow:
+
+  struct setup_data {
+	  u64 next;
+	  u32 type;
+	  u32 len;
+	  u8  data[0];
+  };
+
+  Where, the next is a 64-bit physical pointer to the next node of
+  linked list, the next field of the last node is 0; the type is used
+  to identify the contents of data; the len is the length of data
+  field; the data holds the real payload.
+
+  This list may be modified at a number of points during the bootup
+  process.  Therefore, when modifying this list one should always make
+  sure to consider the case where the linked list already contains
+  entries.
+
+
 **** THE IMAGE CHECKSUM
 
 From boot protocol version 2.08 onwards the CRC-32 is calculated over
@@ -553,6 +587,7 @@ initial remainder of 0xffffffff.  The checksum is appended to the
 file; therefore the CRC of the file up to the limit specified in the
 syssize field of the header is always 0.
 
+
 **** THE KERNEL COMMAND LINE
 
 The kernel command line has become an important way for the boot
@@ -584,28 +619,6 @@ command line is entered using the following protocol:
 	covered by setup_move_size, so you may need to adjust this
 	field.
 
-Field name:	setup_data
-Type:		write (obligatory)
-Offset/size:	0x250/8
-Protocol:	2.09+
-
-  The 64-bit physical pointer to NULL terminated single linked list of
-  struct setup_data. This is used to define a more extensible boot
-  parameters passing mechanism. The definition of struct setup_data is
-  as follow:
-
-  struct setup_data {
-	  u64 next;
-	  u32 type;
-	  u32 len;
-	  u8  data[0];
-  };
-
-  Where, the next is a 64-bit physical pointer to the next node of
-  linked list, the next field of the last node is 0; the type is used
-  to identify the contents of data; the len is the length of data
-  field; the data holds the real payload.
-
 
 **** MEMORY LAYOUT OF THE REAL-MODE CODE
 

arch/x86/Kconfig.debug

@@ -20,6 +20,14 @@ config NONPROMISC_DEVMEM
 
 	  If in doubt, say Y.
 
+config X86_VERBOSE_BOOTUP
+	bool "Enable verbose x86 bootup info messages"
+	default y
+	help
+	  Enables the informational output from the decompression stage
+	  (e.g. bzImage) of the boot. If you disable this you will still
+	  see errors. Disable this if you want silent bootup.
+
 config EARLY_PRINTK
 	bool "Early printk" if EMBEDDED
 	default y

arch/x86/boot/a20.c

 /* -*- linux-c -*- ------------------------------------------------------- *
  *
  *   Copyright (C) 1991, 1992 Linus Torvalds
- *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
  *
  *   This file is part of the Linux kernel, and is made available under
  *   the terms of the GNU General Public License version 2.
@@ -95,6 +95,9 @@ static void enable_a20_kbc(void)
 
 	outb(0xdf, 0x60);	/* A20 on */
 	empty_8042();
+
+	outb(0xff, 0x64);	/* Null command, but UHCI wants it */
+	empty_8042();
 }
 
 static void enable_a20_fast(void)

arch/x86/boot/compressed/misc.c

@@ -30,6 +30,7 @@
 #include <asm/io.h>
 #include <asm/page.h>
 #include <asm/boot.h>
+#include <asm/bootparam.h>
 
 /* WARNING!!
  * This code is compiled with -fPIC and it is relocated dynamically
@@ -187,13 +188,8 @@ static void gzip_release(void **);
 /*
  * This is set up by the setup-routine at boot-time
  */
-static unsigned char *real_mode; /* Pointer to real-mode data */
-
-#define RM_EXT_MEM_K   (*(unsigned short *)(real_mode + 0x2))
-#ifndef STANDARD_MEMORY_BIOS_CALL
-#define RM_ALT_MEM_K   (*(unsigned long *)(real_mode + 0x1e0))
-#endif
-#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))
+static struct boot_params *real_mode;		/* Pointer to real-mode data */
+static int quiet;
 
 extern unsigned char input_data[];
 extern int input_len;
@@ -206,7 +202,8 @@ static void free(void *where);
 static void *memset(void *s, int c, unsigned n);
 static void *memcpy(void *dest, const void *src, unsigned n);
 
-static void putstr(const char *);
+static void __putstr(int, const char *);
+#define putstr(__x)  __putstr(0, __x)
 
 #ifdef CONFIG_X86_64
 #define memptr long
@@ -270,18 +267,24 @@ static void scroll(void)
 		vidmem[i] = ' ';
 }
 
-static void putstr(const char *s)
+static void __putstr(int error, const char *s)
 {
 	int x, y, pos;
 	char c;
 
+#ifndef CONFIG_X86_VERBOSE_BOOTUP
+	if (!error)
+		return;
+#endif
+
 #ifdef CONFIG_X86_32
-	if (RM_SCREEN_INFO.orig_video_mode == 0 && lines == 0 && cols == 0)
+	if (real_mode->screen_info.orig_video_mode == 0 &&
+	    lines == 0 && cols == 0)
 		return;
 #endif
 
-	x = RM_SCREEN_INFO.orig_x;
-	y = RM_SCREEN_INFO.orig_y;
+	x = real_mode->screen_info.orig_x;
+	y = real_mode->screen_info.orig_y;
 
 	while ((c = *s++) != '\0') {
 		if (c == '\n') {
@@ -302,8 +305,8 @@ static void putstr(const char *s)
 		}
 	}
 
-	RM_SCREEN_INFO.orig_x = x;
-	RM_SCREEN_INFO.orig_y = y;
+	real_mode->screen_info.orig_x = x;
+	real_mode->screen_info.orig_y = y;
 
 	pos = (x + cols * y) * 2;	/* Update cursor position */
 	outb(14, vidport);
@@ -366,9 +369,9 @@ static void flush_window(void)
 
 static void error(char *x)
 {
-	putstr("\n\n");
-	putstr(x);
-	putstr("\n\n -- System halted");
+	__putstr(1, "\n\n");
+	__putstr(1, x);
+	__putstr(1, "\n\n -- System halted");
 
 	while (1)
 		asm("hlt");
@@ -395,7 +398,8 @@ static void parse_elf(void *output)
 		return;
 	}
 
-	putstr("Parsing ELF... ");
+	if (!quiet)
+		putstr("Parsing ELF... ");
 
 	phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
 	if (!phdrs)
@@ -430,7 +434,10 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
 {
 	real_mode = rmode;
 
-	if (RM_SCREEN_INFO.orig_video_mode == 7) {
+	if (real_mode->hdr.loadflags & QUIET_FLAG)
+		quiet = 1;
+
+	if (real_mode->screen_info.orig_video_mode == 7) {
 		vidmem = (char *) 0xb0000;
 		vidport = 0x3b4;
 	} else {
@@ -438,8 +445,8 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
 		vidport = 0x3d4;
 	}
 
-	lines = RM_SCREEN_INFO.orig_video_lines;
-	cols = RM_SCREEN_INFO.orig_video_cols;
+	lines = real_mode->screen_info.orig_video_lines;
+	cols = real_mode->screen_info.orig_video_cols;
 
 	window = output;		/* Output buffer (Normally at 1M) */
 	free_mem_ptr     = heap;	/* Heap */
@@ -465,9 +472,11 @@ asmlinkage void decompress_kernel(void *rmode, memptr heap,
 #endif
 
 	makecrc();
-	putstr("\nDecompressing Linux... ");
+	if (!quiet)
+		putstr("\nDecompressing Linux... ");
 	gunzip();
 	parse_elf(output);
-	putstr("done.\nBooting the kernel.\n");
+	if (!quiet)
+		putstr("done.\nBooting the kernel.\n");
 	return;
 }

arch/x86/boot/cpu.c

@@ -28,6 +28,8 @@ static char *cpu_name(int level)
 	if (level == 64) {
 		return "x86-64";
 	} else {
+		if (level == 15)
+			level = 6;
 		sprintf(buf, "i%d86", level);
 		return buf;
 	}

arch/x86/boot/main.c

@@ -165,6 +165,10 @@ void main(void)
 	/* Set the video mode */
 	set_video();
 
+	/* Parse command line for 'quiet' and pass it to decompressor. */
+	if (cmdline_find_option_bool("quiet"))
+		boot_params.hdr.loadflags |= QUIET_FLAG;
+
 	/* Do the last things and invoke protected mode */
 	go_to_protected_mode();
 }

arch/x86/boot/pmjump.S

@@ -33,6 +33,8 @@ protected_mode_jump:
 	movw	%cs, %bx
 	shll	$4, %ebx
 	addl	%ebx, 2f
+	jmp	1f			# Short jump to serialize on 386/486
+1:
 
 	movw	$__BOOT_DS, %cx
 	movw	$__BOOT_TSS, %di
@@ -40,8 +42,6 @@ protected_mode_jump:
 	movl	%cr0, %edx
 	orb	$X86_CR0_PE, %dl	# Protected mode
 	movl	%edx, %cr0
-	jmp	1f			# Short jump to serialize on 386/486
-1:
 
 	# Transition to 32-bit mode
 	.byte	0x66, 0xea		# ljmpl opcode

include/asm-x86/bootparam.h

@@ -40,6 +40,7 @@ struct setup_header {
 	__u8	type_of_loader;
 	__u8	loadflags;
 #define LOADED_HIGH	(1<<0)
+#define QUIET_FLAG	(1<<5)
 #define KEEP_SEGMENTS	(1<<6)
 #define CAN_USE_HEAP	(1<<7)
 	__u16	setup_move_size;