diff options
Diffstat (limited to 'arch/m68k/kernel')
| -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 |
3 files changed, 76 insertions, 24 deletions
diff --git a/arch/m68k/kernel/Makefile b/arch/m68k/kernel/Makefile index 2d5d9be..e47778f 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 0000000..919b837 --- /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 81e610bf..a3cfada 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 |
