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bd4352cadf
Functions invoked early when booting up a cpu can't use tracing because mcount requires a valid 'current_thread_info()' and TLB mappings to be setup. The code path of sun4v_register_mondo_queues --> register_one_mondo is one such case. sun4v_register_mondo_queues already has the necessary 'notrace' annotation, but register_one_mondo does not. Normally register_one_mondo is inlined so the bug doesn't trigger, but with some config/compiler combinations, it won't be so we must properly mark it notrace. While we're here, add 'notrace' annoations to prom_printf and prom_halt so that early error handling won't have the same problem. Reported-by: Alexander Beregalov <a.beregalov@gmail.com> Reported-by: Leif Sawyer <lsawyer@gci.com> Signed-off-by: David S. Miller <davem@davemloft.net>
339 lines
7.5 KiB
C
339 lines
7.5 KiB
C
/*
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* misc.c: Miscellaneous prom functions that don't belong
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* anywhere else.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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#include <asm/system.h>
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#include <asm/ldc.h>
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int prom_service_exists(const char *service_name)
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{
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int err = p1275_cmd("test", P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_INOUT(1, 1), service_name);
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if (err)
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return 0;
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return 1;
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}
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void prom_sun4v_guest_soft_state(void)
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{
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const char *svc = "SUNW,soft-state-supported";
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if (!prom_service_exists(svc))
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return;
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p1275_cmd(svc, P1275_INOUT(0, 0));
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}
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/* Reset and reboot the machine with the command 'bcommand'. */
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void prom_reboot(const char *bcommand)
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{
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#ifdef CONFIG_SUN_LDOMS
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if (ldom_domaining_enabled)
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ldom_reboot(bcommand);
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#endif
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p1275_cmd("boot", P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_INOUT(1, 0), bcommand);
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}
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/* Forth evaluate the expression contained in 'fstring'. */
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void prom_feval(const char *fstring)
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{
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if (!fstring || fstring[0] == 0)
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return;
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p1275_cmd("interpret", P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_INOUT(1, 1), fstring);
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}
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EXPORT_SYMBOL(prom_feval);
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#ifdef CONFIG_SMP
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extern void smp_capture(void);
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extern void smp_release(void);
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#endif
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/* Drop into the prom, with the chance to continue with the 'go'
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* prom command.
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*/
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void prom_cmdline(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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#ifdef CONFIG_SMP
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smp_capture();
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#endif
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p1275_cmd("enter", P1275_INOUT(0, 0));
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#ifdef CONFIG_SMP
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smp_release();
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#endif
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local_irq_restore(flags);
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}
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/* Drop into the prom, but completely terminate the program.
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* No chance of continuing.
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*/
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void notrace prom_halt(void)
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{
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#ifdef CONFIG_SUN_LDOMS
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if (ldom_domaining_enabled)
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ldom_power_off();
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#endif
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again:
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p1275_cmd("exit", P1275_INOUT(0, 0));
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goto again; /* PROM is out to get me -DaveM */
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}
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void prom_halt_power_off(void)
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{
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#ifdef CONFIG_SUN_LDOMS
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if (ldom_domaining_enabled)
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ldom_power_off();
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#endif
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p1275_cmd("SUNW,power-off", P1275_INOUT(0, 0));
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/* if nothing else helps, we just halt */
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prom_halt();
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}
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/* Set prom sync handler to call function 'funcp'. */
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void prom_setcallback(callback_func_t funcp)
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{
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if (!funcp)
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return;
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p1275_cmd("set-callback", P1275_ARG(0, P1275_ARG_IN_FUNCTION) |
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P1275_INOUT(1, 1), funcp);
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}
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/* Get the idprom and stuff it into buffer 'idbuf'. Returns the
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* format type. 'num_bytes' is the number of bytes that your idbuf
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* has space for. Returns 0xff on error.
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*/
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unsigned char prom_get_idprom(char *idbuf, int num_bytes)
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{
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int len;
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len = prom_getproplen(prom_root_node, "idprom");
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if ((len >num_bytes) || (len == -1))
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return 0xff;
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if (!prom_getproperty(prom_root_node, "idprom", idbuf, num_bytes))
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return idbuf[0];
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return 0xff;
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}
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int prom_get_mmu_ihandle(void)
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{
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int node, ret;
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if (prom_mmu_ihandle_cache != 0)
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return prom_mmu_ihandle_cache;
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node = prom_finddevice(prom_chosen_path);
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ret = prom_getint(node, prom_mmu_name);
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if (ret == -1 || ret == 0)
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prom_mmu_ihandle_cache = -1;
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else
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prom_mmu_ihandle_cache = ret;
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return ret;
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}
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static int prom_get_memory_ihandle(void)
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{
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static int memory_ihandle_cache;
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int node, ret;
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if (memory_ihandle_cache != 0)
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return memory_ihandle_cache;
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node = prom_finddevice("/chosen");
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ret = prom_getint(node, "memory");
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if (ret == -1 || ret == 0)
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memory_ihandle_cache = -1;
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else
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memory_ihandle_cache = ret;
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return ret;
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}
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/* Load explicit I/D TLB entries. */
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long prom_itlb_load(unsigned long index,
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unsigned long tte_data,
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unsigned long vaddr)
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{
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return p1275_cmd(prom_callmethod_name,
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(P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_ARG(2, P1275_ARG_IN_64B) |
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P1275_ARG(3, P1275_ARG_IN_64B) |
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P1275_INOUT(5, 1)),
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"SUNW,itlb-load",
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prom_get_mmu_ihandle(),
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/* And then our actual args are pushed backwards. */
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vaddr,
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tte_data,
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index);
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}
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long prom_dtlb_load(unsigned long index,
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unsigned long tte_data,
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unsigned long vaddr)
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{
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return p1275_cmd(prom_callmethod_name,
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(P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_ARG(2, P1275_ARG_IN_64B) |
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P1275_ARG(3, P1275_ARG_IN_64B) |
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P1275_INOUT(5, 1)),
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"SUNW,dtlb-load",
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prom_get_mmu_ihandle(),
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/* And then our actual args are pushed backwards. */
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vaddr,
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tte_data,
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index);
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}
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int prom_map(int mode, unsigned long size,
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unsigned long vaddr, unsigned long paddr)
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{
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int ret = p1275_cmd(prom_callmethod_name,
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(P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_ARG(3, P1275_ARG_IN_64B) |
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P1275_ARG(4, P1275_ARG_IN_64B) |
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P1275_ARG(6, P1275_ARG_IN_64B) |
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P1275_INOUT(7, 1)),
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prom_map_name,
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prom_get_mmu_ihandle(),
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mode,
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size,
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vaddr,
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0,
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paddr);
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if (ret == 0)
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ret = -1;
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return ret;
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}
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void prom_unmap(unsigned long size, unsigned long vaddr)
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{
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p1275_cmd(prom_callmethod_name,
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(P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_ARG(2, P1275_ARG_IN_64B) |
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P1275_ARG(3, P1275_ARG_IN_64B) |
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P1275_INOUT(4, 0)),
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prom_unmap_name,
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prom_get_mmu_ihandle(),
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size,
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vaddr);
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}
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/* Set aside physical memory which is not touched or modified
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* across soft resets.
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*/
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unsigned long prom_retain(const char *name,
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unsigned long pa_low, unsigned long pa_high,
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long size, long align)
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{
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/* XXX I don't think we return multiple values correctly.
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* XXX OBP supposedly returns pa_low/pa_high here, how does
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* XXX it work?
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*/
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/* If align is zero, the pa_low/pa_high args are passed,
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* else they are not.
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*/
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if (align == 0)
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return p1275_cmd("SUNW,retain",
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(P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(5, 2)),
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name, pa_low, pa_high, size, align);
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else
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return p1275_cmd("SUNW,retain",
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(P1275_ARG(0, P1275_ARG_IN_BUF) | P1275_INOUT(3, 2)),
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name, size, align);
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}
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/* Get "Unumber" string for the SIMM at the given
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* memory address. Usually this will be of the form
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* "Uxxxx" where xxxx is a decimal number which is
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* etched into the motherboard next to the SIMM slot
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* in question.
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*/
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int prom_getunumber(int syndrome_code,
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unsigned long phys_addr,
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char *buf, int buflen)
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{
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return p1275_cmd(prom_callmethod_name,
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(P1275_ARG(0, P1275_ARG_IN_STRING) |
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P1275_ARG(3, P1275_ARG_OUT_BUF) |
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P1275_ARG(6, P1275_ARG_IN_64B) |
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P1275_INOUT(8, 2)),
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"SUNW,get-unumber", prom_get_memory_ihandle(),
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buflen, buf, P1275_SIZE(buflen),
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0, phys_addr, syndrome_code);
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}
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/* Power management extensions. */
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void prom_sleepself(void)
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{
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p1275_cmd("SUNW,sleep-self", P1275_INOUT(0, 0));
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}
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int prom_sleepsystem(void)
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{
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return p1275_cmd("SUNW,sleep-system", P1275_INOUT(0, 1));
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}
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int prom_wakeupsystem(void)
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{
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return p1275_cmd("SUNW,wakeup-system", P1275_INOUT(0, 1));
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}
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#ifdef CONFIG_SMP
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void prom_startcpu(int cpunode, unsigned long pc, unsigned long arg)
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{
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p1275_cmd("SUNW,start-cpu", P1275_INOUT(3, 0), cpunode, pc, arg);
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}
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void prom_startcpu_cpuid(int cpuid, unsigned long pc, unsigned long arg)
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{
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p1275_cmd("SUNW,start-cpu-by-cpuid", P1275_INOUT(3, 0),
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cpuid, pc, arg);
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}
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void prom_stopcpu_cpuid(int cpuid)
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{
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p1275_cmd("SUNW,stop-cpu-by-cpuid", P1275_INOUT(1, 0),
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cpuid);
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}
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void prom_stopself(void)
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{
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p1275_cmd("SUNW,stop-self", P1275_INOUT(0, 0));
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}
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void prom_idleself(void)
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{
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p1275_cmd("SUNW,idle-self", P1275_INOUT(0, 0));
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}
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void prom_resumecpu(int cpunode)
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{
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p1275_cmd("SUNW,resume-cpu", P1275_INOUT(1, 0), cpunode);
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}
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#endif
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