diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
| -rw-r--r-- | arch/m68k/Kconfig.debug | 9 | ||||
| -rw-r--r-- | arch/m68k/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/m68k/kernel/early_printk.c | 62 | ||||
| -rw-r--r-- | arch/m68k/kernel/head.S | 36 | ||||
| -rw-r--r-- | arch/m68k/mac/config.c | 29 |
6 files changed, 84 insertions, 56 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 30a8ad0dae53..7da289ee0589 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -892,7 +892,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. (mmio) or 32-bit (mmio32). The options are the same as for ttyS, above. - earlyprintk= [X86,SH,BLACKFIN,ARM] + earlyprintk= [X86,SH,BLACKFIN,ARM,M68k] earlyprintk=vga earlyprintk=efi earlyprintk=xen diff --git a/arch/m68k/Kconfig.debug b/arch/m68k/Kconfig.debug index 229682721240..64776d7ac199 100644 --- a/arch/m68k/Kconfig.debug +++ b/arch/m68k/Kconfig.debug @@ -12,12 +12,17 @@ config BOOTPARAM_STRING config EARLY_PRINTK bool "Early printk" - depends on MVME16x || MAC + depends on !(SUN3 || M68360 || M68000 || COLDFIRE) help Write kernel log output directly to a serial port. + Where implemented, output goes to the framebuffer as well. + PROM console functionality on Sun 3x is not affected by this option. + + Pass "earlyprintk" on the kernel command line to get a + boot console. This is useful for kernel debugging when your machine crashes very - early before the console code is initialized. + early, i.e. before the normal console driver is loaded. You should normally say N here, unless you want to debug such a crash. if !MMU diff --git a/arch/m68k/kernel/Makefile b/arch/m68k/kernel/Makefile index 2d5d9be16273..e47778f8588d 100644 --- a/arch/m68k/kernel/Makefile +++ b/arch/m68k/kernel/Makefile @@ -25,3 +25,5 @@ obj-$(CONFIG_HAS_DMA) += dma.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o obj-$(CONFIG_BOOTINFO_PROC) += bootinfo_proc.o +obj-$(CONFIG_EARLY_PRINTK) += early_printk.o + diff --git a/arch/m68k/kernel/early_printk.c b/arch/m68k/kernel/early_printk.c new file mode 100644 index 000000000000..919b83794545 --- /dev/null +++ b/arch/m68k/kernel/early_printk.c @@ -0,0 +1,62 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (c) 2014 Finn Thain + */ + +#include <linux/kernel.h> +#include <linux/console.h> +#include <linux/init.h> +#include <linux/string.h> +#include <asm/setup.h> + +asmlinkage void __init debug_cons_nputs(const char *s, unsigned n); + +static void debug_cons_write(struct console *c, + const char *s, unsigned n) +{ + debug_cons_nputs(s, n); +} + +static struct console early_console_instance = { + .name = "debug", + .write = debug_cons_write, + .flags = CON_PRINTBUFFER | CON_BOOT, + .index = -1 +}; + +static int __init setup_early_printk(char *buf) +{ + /* MVME16x registers an early console after interrupt setup. */ + if (MACH_IS_MVME16x) + return 0; + + if (early_console || buf) + return 0; + + early_console = &early_console_instance; + register_console(early_console); + + return 0; +} +early_param("earlyprintk", setup_early_printk); + +/* + * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be called + * after init sections are discarded (for platforms that use it). + */ +#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68360) || \ + defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)) + +static int __init unregister_early_console(void) +{ + if (!early_console) + return 0; + + return unregister_console(early_console); +} +late_initcall(unregister_early_console); + +#endif diff --git a/arch/m68k/kernel/head.S b/arch/m68k/kernel/head.S index 81e610bfa237..a3cfada88368 100644 --- a/arch/m68k/kernel/head.S +++ b/arch/m68k/kernel/head.S @@ -221,7 +221,7 @@ * MMU_PRINT: There is a routine built into head.S that can display the * MMU data structures. It outputs its result through the serial_putc * interface. So where ever that winds up driving data, that's where the - * mmu struct will appear. On the Macintosh that's typically the console. + * mmu struct will appear. * * SERIAL_DEBUG: There are a series of putc() macro statements * scattered through out the code to give progress of status to the @@ -249,8 +249,8 @@ * USE_MFP: Use the ST-MFP port (Modem1) for serial debug. * * Macintosh constants: - * MAC_USE_SCC_A: Use SCC port A (modem) for serial debug and early console. - * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug and early console. + * MAC_USE_SCC_A: Use SCC port A (modem) for serial debug. + * MAC_USE_SCC_B: Use SCC port B (printer) for serial debug. */ #include <linux/linkage.h> @@ -267,27 +267,17 @@ #include <asm/pgtable.h> #include <asm/page.h> #include <asm/asm-offsets.h> - #ifdef CONFIG_MAC - -#include <asm/machw.h> - -#ifdef CONFIG_FRAMEBUFFER_CONSOLE -#define CONSOLE_DEBUG +# include <asm/machw.h> #endif #ifdef CONFIG_EARLY_PRINTK -#define SERIAL_DEBUG -#else -#undef SERIAL_DEBUG +# define SERIAL_DEBUG +# if defined(CONFIG_MAC) && defined(CONFIG_FONT_SUPPORT) +# define CONSOLE_DEBUG +# endif #endif -#else /* !CONFIG_MAC */ - -#define SERIAL_DEBUG - -#endif /* !CONFIG_MAC */ - #undef MMU_PRINT #undef MMU_NOCACHE_KERNEL #undef DEBUG @@ -3213,21 +3203,19 @@ func_start putn,%d0-%d2 func_return putn -#ifdef CONFIG_MAC +#ifdef CONFIG_EARLY_PRINTK /* - * mac_early_print - * * This routine takes its parameters on the stack. It then * turns around and calls the internal routines. This routine * is used by the boot console. * * The calling parameters are: - * void mac_early_print(const char *str, unsigned length); + * void debug_cons_nputs(const char *str, unsigned length) * * This routine does NOT understand variable arguments only * simple strings! */ -ENTRY(mac_early_print) +ENTRY(debug_cons_nputs) moveml %d0/%d1/%a0,%sp@- movew %sr,%sp@- ori #0x0700,%sr @@ -3249,7 +3237,7 @@ ENTRY(mac_early_print) movew %sp@+,%sr moveml %sp@+,%d0/%d1/%a0 rts -#endif /* CONFIG_MAC */ +#endif /* CONFIG_EARLY_PRINTK */ #if defined(CONFIG_HP300) || defined(CONFIG_APOLLO) func_start set_leds,%d0/%a0 diff --git a/arch/m68k/mac/config.c b/arch/m68k/mac/config.c index 982c3fe73c4a..a471eab1a4dd 100644 --- a/arch/m68k/mac/config.c +++ b/arch/m68k/mac/config.c @@ -71,31 +71,6 @@ static void mac_get_model(char *str); static void mac_identify(void); static void mac_report_hardware(void); -#ifdef CONFIG_EARLY_PRINTK -asmlinkage void __init mac_early_print(const char *s, unsigned n); - -static void __init mac_early_cons_write(struct console *con, - const char *s, unsigned n) -{ - mac_early_print(s, n); -} - -static struct console __initdata mac_early_cons = { - .name = "early", - .write = mac_early_cons_write, - .flags = CON_PRINTBUFFER | CON_BOOT, - .index = -1 -}; - -int __init mac_unregister_early_cons(void) -{ - /* mac_early_print can't be used after init sections are discarded */ - return unregister_console(&mac_early_cons); -} - -late_initcall(mac_unregister_early_cons); -#endif - static void __init mac_sched_init(irq_handler_t vector) { via_init_clock(vector); @@ -190,10 +165,6 @@ void __init config_mac(void) mach_beep = mac_mksound; #endif -#ifdef CONFIG_EARLY_PRINTK - register_console(&mac_early_cons); -#endif - /* * Determine hardware present */ |