cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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udbg.c (4003B)

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