/* * * Procedures for interfacing to the RTAS on CHRP machines. * * Peter Bergner, IBM March 2001. * Copyright (C) 2001 IBM. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <stdarg.h>#include <linux/kernel.h>#include <linux/types.h>#include <linux/spinlock.h>#include <linux/export.h>#include <linux/init.h>#include <linux/capability.h>#include <linux/delay.h>#include <linux/cpu.h>#include <linux/smp.h>#include <linux/completion.h>#include <linux/cpumask.h>#include <linux/memblock.h>#include <linux/slab.h>#include <linux/reboot.h> #include <asm/prom.h>#include <asm/rtas.h>#include <asm/hvcall.h>#include <asm/machdep.h>#include <asm/firmware.h>#include <asm/page.h>#include <asm/param.h>#include <asm/delay.h>#include <asm/uaccess.h>#include <asm/udbg.h>#include <asm/syscalls.h>#include <asm/smp.h>#include <linux/atomic.h>#include <asm/time.h>#include <asm/mmu.h>#include <asm/topology.h> struct rtas_t rtas = { .lock = __ARCH_SPIN_LOCK_UNLOCKED};EXPORT_SYMBOL(rtas); DEFINE_SPINLOCK(rtas_data_buf_lock);EXPORT_SYMBOL(rtas_data_buf_lock); char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned;EXPORT_SYMBOL(rtas_data_buf); unsigned long rtas_rmo_buf; /* * If non-NULL, this gets called when the kernel terminates. * This is done like this so rtas_flash can be a module. */void (*rtas_flash_term_hook)(int);EXPORT_SYMBOL(rtas_flash_term_hook); /* RTAS use home made raw locking instead of spin_lock_irqsave * because those can be called from within really nasty contexts * such as having the timebase stopped which would lockup with * normal locks and spinlock debugging enabled */static unsigned long lock_rtas(void){ unsigned long flags; local_irq_save(flags); preempt_disable(); arch_spin_lock_flags(&rtas.lock, flags); return flags;} static void unlock_rtas(unsigned long flags){ arch_spin_unlock(&rtas.lock); local_irq_restore(flags); preempt_enable();} /* * call_rtas_display_status and call_rtas_display_status_delay * are designed only for very early low-level debugging, which * is why the token is hard-coded to 10. */static void call_rtas_display_status(unsigned char c){ struct rtas_args *args = &rtas.args; unsigned long s; if (!rtas.base) return; s = lock_rtas(); args->token = cpu_to_be32(10); args->nargs = cpu_to_be32(1); args->nret = cpu_to_be32(1); args->rets = &(args->args[1]); args->args[0] = cpu_to_be32(c); enter_rtas(__pa(args)); unlock_rtas(s);} static void call_rtas_display_status_delay(char c){ static int pending_newline = 0; /* did last write end with unprinted newline? */ static int width = 16; if (c == '\n') { while (width-- > 0) call_rtas_display_status(' '); width = 16; mdelay(500); pending_newline = 1; } else { if (pending_newline) { call_rtas_display_status('\r'); call_rtas_display_status('\n'); } pending_newline = 0; if (width--) { call_rtas_display_status(c); udelay(10000); } }} void __init udbg_init_rtas_panel(void){ udbg_putc = call_rtas_display_status_delay;} #ifdef CONFIG_UDBG_RTAS_CONSOLE /* If you think you're dying before early_init_dt_scan_rtas() does its * work, you can hard code the token values for your firmware here and * hardcode rtas.base/entry etc. */static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE;static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; static void udbg_rtascon_putc(char c){ int tries; if (!rtas.base) return; /* Add CRs before LFs */ if (c == '\n') udbg_rtascon_putc('\r'); /* if there is more than one character to be displayed, wait a bit */ for (tries = 0; tries < 16; tries++) { if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) break; udelay(1000); }} static int udbg_rtascon_getc_poll(void){ int c; if (!rtas.base) return -1; if (rtas_call(rtas_getchar_token, 0, 2, &c)) return -1; return c;} static int udbg_rtascon_getc(void){ int c; while ((c = udbg_rtascon_getc_poll()) == -1) ; return c;} void __init udbg_init_rtas_console(void){ udbg_putc = udbg_rtascon_putc; udbg_getc = udbg_rtascon_getc; udbg_getc_poll = udbg_rtascon_getc_poll;}#endif /* CONFIG_UDBG_RTAS_CONSOLE */ void rtas_progress(char *s, unsigned short hex){ struct device_node *root; int width; const __be32 *p; char *os; static int display_character, set_indicator; static int display_width, display_lines, form_feed; static const int *row_width; static DEFINE_SPINLOCK(progress_lock); static int current_line; static int pending_newline = 0; /* did last write end with unprinted newline? */ if (!rtas.base) return; if (display_width == 0) { display_width = 0x10; if ((root = of_find_node_by_path("/rtas"))) { if ((p = of_get_property(root, "ibm,display-line-length", NULL))) display_width = be32_to_cpu(*p); if ((p = of_get_property(root, "ibm,form-feed", NULL))) form_feed = be32_to_cpu(*p); if ((p = of_get_property(root, "ibm,display-number-of-lines", NULL))) display_lines = be32_to_cpu(*p); row_width = of_get_property(root, "ibm,display-truncation-length", NULL); of_node_put(root); } display_character = rtas_token("display-character"); set_indicator = rtas_token("set-indicator"); } if (display_character == RTAS_UNKNOWN_SERVICE) { /* use hex display if available */ if (set_indicator != RTAS_UNKNOWN_SERVICE) rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); return; } spin_lock(&progress_lock); /* * Last write ended with newline, but we didn't print it since * it would just clear the bottom line of output. Print it now * instead. * * If no newline is pending and form feed is supported, clear the * display with a form feed; otherwise, print a CR to start output * at the beginning of the line. */ if (pending_newline) { rtas_call(display_character, 1, 1, NULL, '\r'); rtas_call(display_character, 1, 1, NULL, '\n'); pending_newline = 0; } else { current_line = 0; if (form_feed) rtas_call(display_character, 1, 1, NULL, (char)form_feed); else rtas_call(display_character, 1, 1, NULL, '\r'); } if (row_width) width = row_width[current_line]; else width = display_width; os = s; while (*os) { if (*os == '\n' || *os == '\r') { /* If newline is the last character, save it * until next call to avoid bumping up the * display output. */ if (*os == '\n' && !os[1]) { pending_newline = 1; current_line++; if (current_line > display_lines-1) current_line = display_lines-1; spin_unlock(&progress_lock); return; } /* RTAS wants CR-LF, not just LF */ if (*os == '\n') { rtas_call(display_character, 1, 1, NULL, '\r'); rtas_call(display_character, 1, 1, NULL, '\n'); } else { /* CR might be used to re-draw a line, so we'll * leave it alone and not add LF. */ rtas_call(display_character, 1, 1, NULL, *os); } if (row_width) width = row_width[current_line]; else width = display_width; } else { width--; rtas_call(display_character, 1, 1, NULL, *os); } os++; /* if we overwrite the screen length */ if (width <= 0) while ((*os != 0) && (*os != '\n') && (*os != '\r')) os++; } spin_unlock(&progress_lock);}EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ int rtas_token(const char *service){ const __be32 *tokp; if (rtas.dev == NULL) return RTAS_UNKNOWN_SERVICE; tokp = of_get_property(rtas.dev, service, NULL); return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE;}EXPORT_SYMBOL(rtas_token); int rtas_service_present(const char *service){ return rtas_token(service) != RTAS_UNKNOWN_SERVICE;}EXPORT_SYMBOL(rtas_service_present); #ifdef CONFIG_RTAS_ERROR_LOGGING/* * Return the firmware-specified size of the error log buffer * for all rtas calls that require an error buffer argument. * This includes 'check-exception' and 'rtas-last-error'. */int rtas_get_error_log_max(void){ static int rtas_error_log_max; if (rtas_error_log_max) return rtas_error_log_max; rtas_error_log_max = rtas_token ("rtas-error-log-max"); if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { printk (KERN_WARNING "RTAS: bad log buffer size %d\n", rtas_error_log_max); rtas_error_log_max = RTAS_ERROR_LOG_MAX; } return rtas_error_log_max;}EXPORT_SYMBOL(rtas_get_error_log_max); static char rtas_err_buf[RTAS_ERROR_LOG_MAX];static int rtas_last_error_token; /** Return a copy of the detailed error text associated with the * most recent failed call to rtas. Because the error text * might go stale if there are any other intervening rtas calls, * this routine must be called atomically with whatever produced * the error (i.e. with rtas.lock still held from the previous call). */static char *__fetch_rtas_last_error(char *altbuf){ struct rtas_args err_args, save_args; u32 bufsz; char *buf = NULL; if (rtas_last_error_token == -1) return NULL; bufsz = rtas_get_error_log_max(); err_args.token = cpu_to_be32(rtas_last_error_token); err_args.nargs = cpu_to_be32(2); err_args.nret = cpu_to_be32(1); err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf)); err_args.args[1] = cpu_to_be32(bufsz); err_args.args[2] = 0; save_args = rtas.args; rtas.args = err_args; enter_rtas(__pa(&rtas.args)); err_args = rtas.args; rtas.args = save_args; /* Log the error in the unlikely case that there was one. */ if (unlikely(err_args.args[2] == 0)) { if (altbuf) { buf = altbuf; } else { buf = rtas_err_buf; if (mem_init_done) buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); } if (buf) memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); } return buf;} #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) #else /* CONFIG_RTAS_ERROR_LOGGING */#define __fetch_rtas_last_error(x) NULL#define get_errorlog_buffer() NULL#endif int rtas_call(int token, int nargs, int nret, int *outputs, ...){ va_list list; int i; unsigned long s; struct rtas_args *rtas_args; char *buff_copy = NULL; int ret; if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) return -1; s = lock_rtas(); rtas_args = &rtas.args; rtas_args->token = cpu_to_be32(token); rtas_args->nargs = cpu_to_be32(nargs); rtas_args->nret = cpu_to_be32(nret); rtas_args->rets = &(rtas_args->args[nargs]); va_start(list, outputs); for (i = 0; i < nargs; ++i) rtas_args->args[i] = cpu_to_be32(va_arg(list, __u32)); va_end(list); for (i = 0; i < nret; ++i) rtas_args->rets[i] = 0; enter_rtas(__pa(rtas_args)); /* A -1 return code indicates that the last command couldn't be completed due to a hardware error. */ if (be32_to_cpu(rtas_args->rets[0]) == -1) buff_copy = __fetch_rtas_last_error(NULL); if (nret > 1 && outputs != NULL) for (i = 0; i < nret-1; ++i) outputs[i] = be32_to_cpu(rtas_args->rets[i+1]); ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0; unlock_rtas(s); if (buff_copy) { log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); if (mem_init_done) kfree(buff_copy); } return ret;}EXPORT_SYMBOL(rtas_call); /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. */unsigned int rtas_busy_delay_time(int status){ int order; unsigned int ms = 0; if (status == RTAS_BUSY) { ms = 1; } else if (status >= 9900 && status <= 9905) { order = status - 9900; for (ms = 1; order > 0; order--) ms *= 10; } return ms;}EXPORT_SYMBOL(rtas_busy_delay_time); /* For an RTAS busy status code, perform the hinted delay. */unsigned int rtas_busy_delay(int status){ unsigned int ms; might_sleep(); ms = rtas_busy_delay_time(status); if (ms && need_resched()) msleep(ms); Lines 1–500 of 1200. Load more
/* * * Procedures for interfacing to the RTAS on CHRP machines. * * Peter Bergner, IBM March 2001. * Copyright (C) 2001 IBM. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <stdarg.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/spinlock.h> #include <linux/export.h> #include <linux/init.h> #include <linux/capability.h> #include <linux/delay.h> #include <linux/cpu.h> #include <linux/smp.h> #include <linux/completion.h> #include <linux/cpumask.h> #include <linux/memblock.h> #include <linux/slab.h> #include <linux/reboot.h> #include <asm/prom.h> #include <asm/rtas.h> #include <asm/hvcall.h> #include <asm/machdep.h> #include <asm/firmware.h> #include <asm/page.h> #include <asm/param.h> #include <asm/delay.h> #include <asm/uaccess.h> #include <asm/udbg.h> #include <asm/syscalls.h> #include <asm/smp.h> #include <linux/atomic.h> #include <asm/time.h> #include <asm/mmu.h> #include <asm/topology.h> struct rtas_t rtas = { .lock = __ARCH_SPIN_LOCK_UNLOCKED }; EXPORT_SYMBOL(rtas); DEFINE_SPINLOCK(rtas_data_buf_lock); EXPORT_SYMBOL(rtas_data_buf_lock); char rtas_data_buf[RTAS_DATA_BUF_SIZE] __cacheline_aligned; EXPORT_SYMBOL(rtas_data_buf); unsigned long rtas_rmo_buf; /* * If non-NULL, this gets called when the kernel terminates. * This is done like this so rtas_flash can be a module. */ void (*rtas_flash_term_hook)(int); EXPORT_SYMBOL(rtas_flash_term_hook); /* RTAS use home made raw locking instead of spin_lock_irqsave * because those can be called from within really nasty contexts * such as having the timebase stopped which would lockup with * normal locks and spinlock debugging enabled */ static unsigned long lock_rtas(void) { unsigned long flags; local_irq_save(flags); preempt_disable(); arch_spin_lock_flags(&rtas.lock, flags); return flags; } static void unlock_rtas(unsigned long flags) { arch_spin_unlock(&rtas.lock); local_irq_restore(flags); preempt_enable(); } /* * call_rtas_display_status and call_rtas_display_status_delay * are designed only for very early low-level debugging, which * is why the token is hard-coded to 10. */ static void call_rtas_display_status(unsigned char c) { struct rtas_args *args = &rtas.args; unsigned long s; if (!rtas.base) return; s = lock_rtas(); args->token = cpu_to_be32(10); args->nargs = cpu_to_be32(1); args->nret = cpu_to_be32(1); args->rets = &(args->args[1]); args->args[0] = cpu_to_be32(c); enter_rtas(__pa(args)); unlock_rtas(s); } static void call_rtas_display_status_delay(char c) { static int pending_newline = 0; /* did last write end with unprinted newline? */ static int width = 16; if (c == '\n') { while (width-- > 0) call_rtas_display_status(' '); width = 16; mdelay(500); pending_newline = 1; } else { if (pending_newline) { call_rtas_display_status('\r'); call_rtas_display_status('\n'); } pending_newline = 0; if (width--) { call_rtas_display_status(c); udelay(10000); } } } void __init udbg_init_rtas_panel(void) { udbg_putc = call_rtas_display_status_delay; } #ifdef CONFIG_UDBG_RTAS_CONSOLE /* If you think you're dying before early_init_dt_scan_rtas() does its * work, you can hard code the token values for your firmware here and * hardcode rtas.base/entry etc. */ static unsigned int rtas_putchar_token = RTAS_UNKNOWN_SERVICE; static unsigned int rtas_getchar_token = RTAS_UNKNOWN_SERVICE; static void udbg_rtascon_putc(char c) { int tries; if (!rtas.base) return; /* Add CRs before LFs */ if (c == '\n') udbg_rtascon_putc('\r'); /* if there is more than one character to be displayed, wait a bit */ for (tries = 0; tries < 16; tries++) { if (rtas_call(rtas_putchar_token, 1, 1, NULL, c) == 0) break; udelay(1000); } } static int udbg_rtascon_getc_poll(void) { int c; if (!rtas.base) return -1; if (rtas_call(rtas_getchar_token, 0, 2, &c)) return -1; return c; } static int udbg_rtascon_getc(void) { int c; while ((c = udbg_rtascon_getc_poll()) == -1) ; return c; } void __init udbg_init_rtas_console(void) { udbg_putc = udbg_rtascon_putc; udbg_getc = udbg_rtascon_getc; udbg_getc_poll = udbg_rtascon_getc_poll; } #endif /* CONFIG_UDBG_RTAS_CONSOLE */ void rtas_progress(char *s, unsigned short hex) { struct device_node *root; int width; const __be32 *p; char *os; static int display_character, set_indicator; static int display_width, display_lines, form_feed; static const int *row_width; static DEFINE_SPINLOCK(progress_lock); static int current_line; static int pending_newline = 0; /* did last write end with unprinted newline? */ if (!rtas.base) return; if (display_width == 0) { display_width = 0x10; if ((root = of_find_node_by_path("/rtas"))) { if ((p = of_get_property(root, "ibm,display-line-length", NULL))) display_width = be32_to_cpu(*p); if ((p = of_get_property(root, "ibm,form-feed", NULL))) form_feed = be32_to_cpu(*p); if ((p = of_get_property(root, "ibm,display-number-of-lines", NULL))) display_lines = be32_to_cpu(*p); row_width = of_get_property(root, "ibm,display-truncation-length", NULL); of_node_put(root); } display_character = rtas_token("display-character"); set_indicator = rtas_token("set-indicator"); } if (display_character == RTAS_UNKNOWN_SERVICE) { /* use hex display if available */ if (set_indicator != RTAS_UNKNOWN_SERVICE) rtas_call(set_indicator, 3, 1, NULL, 6, 0, hex); return; } spin_lock(&progress_lock); /* * Last write ended with newline, but we didn't print it since * it would just clear the bottom line of output. Print it now * instead. * * If no newline is pending and form feed is supported, clear the * display with a form feed; otherwise, print a CR to start output * at the beginning of the line. */ if (pending_newline) { rtas_call(display_character, 1, 1, NULL, '\r'); rtas_call(display_character, 1, 1, NULL, '\n'); pending_newline = 0; } else { current_line = 0; if (form_feed) rtas_call(display_character, 1, 1, NULL, (char)form_feed); else rtas_call(display_character, 1, 1, NULL, '\r'); } if (row_width) width = row_width[current_line]; else width = display_width; os = s; while (*os) { if (*os == '\n' || *os == '\r') { /* If newline is the last character, save it * until next call to avoid bumping up the * display output. */ if (*os == '\n' && !os[1]) { pending_newline = 1; current_line++; if (current_line > display_lines-1) current_line = display_lines-1; spin_unlock(&progress_lock); return; } /* RTAS wants CR-LF, not just LF */ if (*os == '\n') { rtas_call(display_character, 1, 1, NULL, '\r'); rtas_call(display_character, 1, 1, NULL, '\n'); } else { /* CR might be used to re-draw a line, so we'll * leave it alone and not add LF. */ rtas_call(display_character, 1, 1, NULL, *os); } if (row_width) width = row_width[current_line]; else width = display_width; } else { width--; rtas_call(display_character, 1, 1, NULL, *os); } os++; /* if we overwrite the screen length */ if (width <= 0) while ((*os != 0) && (*os != '\n') && (*os != '\r')) os++; } spin_unlock(&progress_lock); } EXPORT_SYMBOL(rtas_progress); /* needed by rtas_flash module */ int rtas_token(const char *service) { const __be32 *tokp; if (rtas.dev == NULL) return RTAS_UNKNOWN_SERVICE; tokp = of_get_property(rtas.dev, service, NULL); return tokp ? be32_to_cpu(*tokp) : RTAS_UNKNOWN_SERVICE; } EXPORT_SYMBOL(rtas_token); int rtas_service_present(const char *service) { return rtas_token(service) != RTAS_UNKNOWN_SERVICE; } EXPORT_SYMBOL(rtas_service_present); #ifdef CONFIG_RTAS_ERROR_LOGGING /* * Return the firmware-specified size of the error log buffer * for all rtas calls that require an error buffer argument. * This includes 'check-exception' and 'rtas-last-error'. */ int rtas_get_error_log_max(void) { static int rtas_error_log_max; if (rtas_error_log_max) return rtas_error_log_max; rtas_error_log_max = rtas_token ("rtas-error-log-max"); if ((rtas_error_log_max == RTAS_UNKNOWN_SERVICE) || (rtas_error_log_max > RTAS_ERROR_LOG_MAX)) { printk (KERN_WARNING "RTAS: bad log buffer size %d\n", rtas_error_log_max); rtas_error_log_max = RTAS_ERROR_LOG_MAX; } return rtas_error_log_max; } EXPORT_SYMBOL(rtas_get_error_log_max); static char rtas_err_buf[RTAS_ERROR_LOG_MAX]; static int rtas_last_error_token; /** Return a copy of the detailed error text associated with the * most recent failed call to rtas. Because the error text * might go stale if there are any other intervening rtas calls, * this routine must be called atomically with whatever produced * the error (i.e. with rtas.lock still held from the previous call). */ static char *__fetch_rtas_last_error(char *altbuf) { struct rtas_args err_args, save_args; u32 bufsz; char *buf = NULL; if (rtas_last_error_token == -1) return NULL; bufsz = rtas_get_error_log_max(); err_args.token = cpu_to_be32(rtas_last_error_token); err_args.nargs = cpu_to_be32(2); err_args.nret = cpu_to_be32(1); err_args.args[0] = cpu_to_be32(__pa(rtas_err_buf)); err_args.args[1] = cpu_to_be32(bufsz); err_args.args[2] = 0; save_args = rtas.args; rtas.args = err_args; enter_rtas(__pa(&rtas.args)); err_args = rtas.args; rtas.args = save_args; /* Log the error in the unlikely case that there was one. */ if (unlikely(err_args.args[2] == 0)) { if (altbuf) { buf = altbuf; } else { buf = rtas_err_buf; if (mem_init_done) buf = kmalloc(RTAS_ERROR_LOG_MAX, GFP_ATOMIC); } if (buf) memcpy(buf, rtas_err_buf, RTAS_ERROR_LOG_MAX); } return buf; } #define get_errorlog_buffer() kmalloc(RTAS_ERROR_LOG_MAX, GFP_KERNEL) #else /* CONFIG_RTAS_ERROR_LOGGING */ #define __fetch_rtas_last_error(x) NULL #define get_errorlog_buffer() NULL #endif int rtas_call(int token, int nargs, int nret, int *outputs, ...) { va_list list; int i; unsigned long s; struct rtas_args *rtas_args; char *buff_copy = NULL; int ret; if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE) return -1; s = lock_rtas(); rtas_args = &rtas.args; rtas_args->token = cpu_to_be32(token); rtas_args->nargs = cpu_to_be32(nargs); rtas_args->nret = cpu_to_be32(nret); rtas_args->rets = &(rtas_args->args[nargs]); va_start(list, outputs); for (i = 0; i < nargs; ++i) rtas_args->args[i] = cpu_to_be32(va_arg(list, __u32)); va_end(list); for (i = 0; i < nret; ++i) rtas_args->rets[i] = 0; enter_rtas(__pa(rtas_args)); /* A -1 return code indicates that the last command couldn't be completed due to a hardware error. */ if (be32_to_cpu(rtas_args->rets[0]) == -1) buff_copy = __fetch_rtas_last_error(NULL); if (nret > 1 && outputs != NULL) for (i = 0; i < nret-1; ++i) outputs[i] = be32_to_cpu(rtas_args->rets[i+1]); ret = (nret > 0)? be32_to_cpu(rtas_args->rets[0]): 0; unlock_rtas(s); if (buff_copy) { log_error(buff_copy, ERR_TYPE_RTAS_LOG, 0); if (mem_init_done) kfree(buff_copy); } return ret; } EXPORT_SYMBOL(rtas_call); /* For RTAS_BUSY (-2), delay for 1 millisecond. For an extended busy status * code of 990n, perform the hinted delay of 10^n (last digit) milliseconds. */ unsigned int rtas_busy_delay_time(int status) { int order; unsigned int ms = 0; if (status == RTAS_BUSY) { ms = 1; } else if (status >= 9900 && status <= 9905) { order = status - 9900; for (ms = 1; order > 0; order--) ms *= 10; } return ms; } EXPORT_SYMBOL(rtas_busy_delay_time); /* For an RTAS busy status code, perform the hinted delay. */ unsigned int rtas_busy_delay(int status) { unsigned int ms; might_sleep(); ms = rtas_busy_delay_time(status); if (ms && need_resched()) msleep(ms);