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Subject[tip:x86/setup] x86, setup: reorganize the early console setup
Commit-ID:  f4ed2877b16e8146427306aea8819adac5c88374
Gitweb: http://git.kernel.org/tip/f4ed2877b16e8146427306aea8819adac5c88374
Author: Yinghai Lu <yinghai@kernel.org>
AuthorDate: Mon, 2 Aug 2010 02:17:31 -0700
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Mon, 2 Aug 2010 15:51:56 -0700

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: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <4C568D2B.205@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/boot/Makefile | 8 +-
arch/x86/boot/boot.h | 35 ++++-----
arch/x86/boot/cmdline.c | 6 +-
arch/x86/boot/early_serial_console.c | 139 ++++++++++++++++++++++++++++++++++
arch/x86/boot/isdigit.h | 21 +++++
arch/x86/boot/printf.c | 4 +-
arch/x86/boot/tty.c | 136 +---------------------------------
7 files changed, 186 insertions(+), 163 deletions(-)
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index ec749c2..f7cb086 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -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,
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index 46c4c5c..00cf51c 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -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);
diff --git a/arch/x86/boot/cmdline.c b/arch/x86/boot/cmdline.c
index a1d3563..6b3b6f7 100644
--- a/arch/x86/boot/cmdline.c
+++ b/arch/x86/boot/cmdline.c
@@ -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;
diff --git a/arch/x86/boot/early_serial_console.c b/arch/x86/boot/early_serial_console.c
new file mode 100644
index 0000000..030f4b9
--- /dev/null
+++ b/arch/x86/boot/early_serial_console.c
@@ -0,0 +1,139 @@
+#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();
+}
diff --git a/arch/x86/boot/isdigit.h b/arch/x86/boot/isdigit.h
new file mode 100644
index 0000000..25e1340
--- /dev/null
+++ b/arch/x86/boot/isdigit.h
@@ -0,0 +1,21 @@
+#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
diff --git a/arch/x86/boot/printf.c b/arch/x86/boot/printf.c
index 50e47cd..cdac91c 100644
--- a/arch/x86/boot/printf.c
+++ b/arch/x86/boot/printf.c
@@ -34,7 +34,7 @@ static int skip_atoi(const char **s)
#define SMALL 32 /* Must be 32 == 0x20 */
#define SPECIAL 64 /* 0x */

-#define do_div(n,base) ({ \
+#define __do_div(n, base) ({ \
int __res; \
__res = ((unsigned long) n) % (unsigned) base; \
n = ((unsigned long) n) / (unsigned) base; \
@@ -83,7 +83,7 @@ static char *number(char *str, long num, int base, int size, int precision,
tmp[i++] = '0';
else
while (num != 0)
- tmp[i++] = (digits[do_div(num, base)] | locase);
+ tmp[i++] = (digits[__do_div(num, base)] | locase);
if (i > precision)
precision = i;
size -= precision;
diff --git a/arch/x86/boot/tty.c b/arch/x86/boot/tty.c
index ff4b27a..def2451 100644
--- a/arch/x86/boot/tty.c
+++ b/arch/x86/boot/tty.c
@@ -15,27 +15,12 @@

#include "boot.h"

-#define DEFAULT_SERIAL_PORT 0x3f8 /* ttyS0 */
-
-static int early_serial_base;
+int early_serial_base;

#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

/*
* These functions are in .inittext so they can be used to signal
@@ -152,122 +137,3 @@ int getchar_timeout(void)
return 0; /* Timeout! */
}

-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;
-
- printf("Early serial console at I/O port 0x%x baud: %d\n", port, baud);
-}
-
-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();
-}

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