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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 | // SPDX-License-Identifier: GPL-2.0-or-later /* * polling mode stateless debugging stuff, originally for NS16550 Serial Ports * * c 2001 PPC 64 Team, IBM Corp */ #include <linux/stdarg.h> #include <linux/types.h> #include <linux/sched.h> #include <linux/console.h> #include <linux/init.h> #include <asm/processor.h> #include <asm/udbg.h> void (*udbg_putc)(char c); void (*udbg_flush)(void); int (*udbg_getc)(void); int (*udbg_getc_poll)(void); /* * Early debugging facilities. You can enable _one_ of these via .config, * if you do so your kernel _will not boot_ on anything else. Be careful. */ void __init udbg_early_init(void) { #if defined(CONFIG_PPC_EARLY_DEBUG_LPAR) /* For LPAR machines that have an HVC console on vterm 0 */ udbg_init_debug_lpar(); #elif defined(CONFIG_PPC_EARLY_DEBUG_LPAR_HVSI) /* For LPAR machines that have an HVSI console on vterm 0 */ udbg_init_debug_lpar_hvsi(); #elif defined(CONFIG_PPC_EARLY_DEBUG_G5) /* For use on Apple G5 machines */ udbg_init_pmac_realmode(); #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL) /* RTAS panel debug */ udbg_init_rtas_panel(); #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE) /* RTAS console debug */ udbg_init_rtas_console(); #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE) /* Maple real mode debug */ udbg_init_maple_realmode(); #elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE) udbg_init_pas_realmode(); #elif defined(CONFIG_PPC_EARLY_DEBUG_BOOTX) udbg_init_btext(); #elif defined(CONFIG_PPC_EARLY_DEBUG_44x) /* PPC44x debug */ udbg_init_44x_as1(); #elif defined(CONFIG_PPC_EARLY_DEBUG_40x) /* PPC40x debug */ udbg_init_40x_realmode(); #elif defined(CONFIG_PPC_EARLY_DEBUG_CPM) udbg_init_cpm(); #elif defined(CONFIG_PPC_EARLY_DEBUG_USBGECKO) udbg_init_usbgecko(); #elif defined(CONFIG_PPC_EARLY_DEBUG_MEMCONS) /* In memory console */ udbg_init_memcons(); #elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC) udbg_init_ehv_bc(); #elif defined(CONFIG_PPC_EARLY_DEBUG_PS3GELIC) udbg_init_ps3gelic(); #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_RAW) udbg_init_debug_opal_raw(); #elif defined(CONFIG_PPC_EARLY_DEBUG_OPAL_HVSI) udbg_init_debug_opal_hvsi(); #elif defined(CONFIG_PPC_EARLY_DEBUG_16550) udbg_init_debug_16550(); #endif #ifdef CONFIG_PPC_EARLY_DEBUG console_loglevel = CONSOLE_LOGLEVEL_DEBUG; register_early_udbg_console(); #endif } /* udbg library, used by xmon et al */ void udbg_puts(const char *s) { if (udbg_putc) { char c; if (s && *s != '\0') { while ((c = *s++) != '\0') udbg_putc(c); } if (udbg_flush) udbg_flush(); } #if 0 else { printk("%s", s); } #endif } int udbg_write(const char *s, int n) { int remain = n; char c; if (!udbg_putc) return 0; if (s && *s != '\0') { while (((c = *s++) != '\0') && (remain-- > 0)) { udbg_putc(c); } } if (udbg_flush) udbg_flush(); return n - remain; } #define UDBG_BUFSIZE 256 void udbg_printf(const char *fmt, ...) { if (udbg_putc) { char buf[UDBG_BUFSIZE]; va_list args; va_start(args, fmt); vsnprintf(buf, UDBG_BUFSIZE, fmt, args); udbg_puts(buf); va_end(args); } } void __init udbg_progress(char *s, unsigned short hex) { udbg_puts(s); udbg_puts("\n"); } /* * Early boot console based on udbg */ static void udbg_console_write(struct console *con, const char *s, unsigned int n) { udbg_write(s, n); } static struct console udbg_console = { .name = "udbg", .write = udbg_console_write, .flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME, .index = 0, }; /* * Called by setup_system after ppc_md->probe and ppc_md->early_init. * Call it again after setting udbg_putc in ppc_md->setup_arch. */ void __init register_early_udbg_console(void) { if (early_console) return; if (!udbg_putc) return; if (strstr(boot_command_line, "udbg-immortal")) { printk(KERN_INFO "early console immortal !\n"); udbg_console.flags &= ~CON_BOOT; } early_console = &udbg_console; register_console(&udbg_console); } #if 0 /* if you want to use this as a regular output console */ console_initcall(register_udbg_console); #endif |