Commit f4ed2877 authored by Yinghai Lu's avatar Yinghai Lu Committed by H. Peter Anvin
Browse files

x86, setup: reorganize the early console setup 



Separate early_serial_console from tty.c

This allows for reuse of
early_serial_console.c/string.c/printf.c/cmdline.c in boot/compressed/.

-v2: according to hpa, don't include string.c etc
-v3: compressed/misc.c must have early_serial_base as static, so move it back to tty.c
     for setup code

Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
LKML-Reference: <4C568D2B.205@kernel.org>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 22a57f58

arch/x86/boot/Makefile

+4 −4
Original line number Diff line number Diff line
@@ -26,10 +26,10 @@ targets := vmlinux.bin setup.bin setup.elf bzImage 
targets		+= fdimage fdimage144 fdimage288 image.iso mtools.conf

subdir-		:= compressed



setup-y		+= a20.o bioscall.o cmdline.o copy.o cpu.o cpucheck.o edd.o

setup-y		+= header.o main.o mca.o memory.o pm.o pmjump.o

setup-y		+= printf.o regs.o string.o tty.o video.o video-mode.o

setup-y		+= version.o

setup-y		+= a20.o bioscall.o cmdline.o copy.o cpu.o cpucheck.o

setup-y		+= early_serial_console.o edd.o header.o main.o mca.o memory.o

setup-y		+= pm.o pmjump.o printf.o regs.o string.o tty.o video.o

setup-y		+= video-mode.o version.o

setup-$(CONFIG_X86_APM_BOOT) += apm.o



# The link order of the video-*.o modules can matter.  In particular,

arch/x86/boot/boot.h

+17 −18
Original line number Diff line number Diff line
@@ -200,21 +200,7 @@ static inline int memcmp_gs(const void *s1, addr_t s2, size_t len) 
	return diff;

}



static inline int isdigit(int ch)

{

	return (ch >= '0') && (ch <= '9');

}



static inline int isxdigit(int ch)

{

	if (isdigit(ch))

		return true;



	if ((ch >= 'a') && (ch <= 'f'))

		return true;



	return (ch >= 'A') && (ch <= 'F');

}

#include "isdigit.h"



/* Heap -- available for dynamic lists. */

extern char _end[];
@@ -300,8 +286,18 @@ struct biosregs { 
void intcall(u8 int_no, const struct biosregs *ireg, struct biosregs *oreg);



/* cmdline.c */

int cmdline_find_option(const char *option, char *buffer, int bufsize);

int cmdline_find_option_bool(const char *option);

int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int bufsize);

int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option);

static inline int cmdline_find_option(const char *option, char *buffer, int bufsize)

{

	return __cmdline_find_option(boot_params.hdr.cmd_line_ptr, option, buffer, bufsize);

}



static inline int cmdline_find_option_bool(const char *option)

{

	return __cmdline_find_option_bool(boot_params.hdr.cmd_line_ptr, option);

}





/* cpu.c, cpucheck.c */

struct cpu_features {
@@ -313,6 +309,10 @@ extern struct cpu_features cpu; 
int check_cpu(int *cpu_level_ptr, int *req_level_ptr, u32 **err_flags_ptr);

int validate_cpu(void);



/* early_serial_console.c */

extern int early_serial_base;

void console_init(void);



/* edd.c */

void query_edd(void);
@@ -348,7 +348,6 @@ unsigned int atou(const char *s); 
unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base);



/* tty.c */

void console_init(void);

void puts(const char *);

void putchar(int);

int getchar(void);

arch/x86/boot/cmdline.c

+2 −4
Original line number Diff line number Diff line
@@ -27,9 +27,8 @@ static inline int myisspace(u8 c) 
 * Returns the length of the argument (regardless of if it was

 * truncated to fit in the buffer), or -1 on not found.

 */

int cmdline_find_option(const char *option, char *buffer, int bufsize)

int __cmdline_find_option(u32 cmdline_ptr, const char *option, char *buffer, int bufsize)

{

	u32 cmdline_ptr = boot_params.hdr.cmd_line_ptr;

	addr_t cptr;

	char c;

	int len = -1;
@@ -100,9 +99,8 @@ int cmdline_find_option(const char *option, char *buffer, int bufsize) 
 * Returns the position of that option (starts counting with 1)

 * or 0 on not found

 */

int cmdline_find_option_bool(const char *option)

int __cmdline_find_option_bool(u32 cmdline_ptr, const char *option)

{

	u32 cmdline_ptr = boot_params.hdr.cmd_line_ptr;

	addr_t cptr;

	char c;

	int pos = 0, wstart = 0;

arch/x86/boot/early_serial_console.c

0 → 100644
+139 −0
Original line number Diff line number Diff line 
#include "boot.h"



#define DEFAULT_SERIAL_PORT 0x3f8 /* ttyS0 */



#define XMTRDY          0x20



#define DLAB		0x80



#define TXR             0       /*  Transmit register (WRITE) */

#define RXR             0       /*  Receive register  (READ)  */

#define IER             1       /*  Interrupt Enable          */

#define IIR             2       /*  Interrupt ID              */

#define FCR             2       /*  FIFO control              */

#define LCR             3       /*  Line control              */

#define MCR             4       /*  Modem control             */

#define LSR             5       /*  Line Status               */

#define MSR             6       /*  Modem Status              */

#define DLL             0       /*  Divisor Latch Low         */

#define DLH             1       /*  Divisor latch High        */



#define DEFAULT_BAUD 9600



static void early_serial_init(int port, int baud)

{

	unsigned char c;

	unsigned divisor;



	outb(0x3, port + LCR);	/* 8n1 */

	outb(0, port + IER);	/* no interrupt */

	outb(0, port + FCR);	/* no fifo */

	outb(0x3, port + MCR);	/* DTR + RTS */



	divisor	= 115200 / baud;

	c = inb(port + LCR);

	outb(c | DLAB, port + LCR);

	outb(divisor & 0xff, port + DLL);

	outb((divisor >> 8) & 0xff, port + DLH);

	outb(c & ~DLAB, port + LCR);



	early_serial_base = port;

}



static void parse_earlyprintk(void)

{

	int baud = DEFAULT_BAUD;

	char arg[32];

	int pos = 0;

	int port = 0;



	if (cmdline_find_option("earlyprintk", arg, sizeof arg) > 0) {

		char *e;



		if (!strncmp(arg, "serial", 6)) {

			port = DEFAULT_SERIAL_PORT;

			pos += 6;

		}



		if (arg[pos] == ',')

			pos++;



		if (!strncmp(arg, "ttyS", 4)) {

			static const int bases[] = { 0x3f8, 0x2f8 };

			int idx = 0;



			if (!strncmp(arg + pos, "ttyS", 4))

				pos += 4;



			if (arg[pos++] == '1')

				idx = 1;



			port = bases[idx];

		}



		if (arg[pos] == ',')

			pos++;



		baud = simple_strtoull(arg + pos, &e, 0);

		if (baud == 0 || arg + pos == e)

			baud = DEFAULT_BAUD;

	}



	if (port)

		early_serial_init(port, baud);

}



#define BASE_BAUD (1843200/16)

static unsigned int probe_baud(int port)

{

	unsigned char lcr, dll, dlh;

	unsigned int quot;



	lcr = inb(port + LCR);

	outb(lcr | DLAB, port + LCR);

	dll = inb(port + DLL);

	dlh = inb(port + DLH);

	outb(lcr, port + LCR);

	quot = (dlh << 8) | dll;



	return BASE_BAUD / quot;

}



static void parse_console_uart8250(void)

{

	char optstr[64], *options;

	int baud = DEFAULT_BAUD;

	int port = 0;



	/*

	 * console=uart8250,io,0x3f8,115200n8

	 * need to make sure it is last one console !

	 */

	if (cmdline_find_option("console", optstr, sizeof optstr) <= 0)

		return;



	options = optstr;



	if (!strncmp(options, "uart8250,io,", 12))

		port = simple_strtoull(options + 12, &options, 0);

	else if (!strncmp(options, "uart,io,", 8))

		port = simple_strtoull(options + 8, &options, 0);

	else

		return;



	if (options && (options[0] == ','))

		baud = simple_strtoull(options + 1, &options, 0);

	else

		baud = probe_baud(port);



	if (port)

		early_serial_init(port, baud);

}



void console_init(void)

{

	parse_earlyprintk();



	if (!early_serial_base)

		parse_console_uart8250();

}

arch/x86/boot/isdigit.h

0 → 100644
+21 −0
Original line number Diff line number Diff line 
#ifndef BOOT_ISDIGIT_H



#define BOOT_ISDIGIT_H



static inline int isdigit(int ch)

{

	return (ch >= '0') && (ch <= '9');

}



static inline int isxdigit(int ch)

{

	if (isdigit(ch))

		return true;



	if ((ch >= 'a') && (ch <= 'f'))

		return true;



	return (ch >= 'A') && (ch <= 'F');

}



#endif

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