forked from Minki/linux
301feb6524
As noted by Al Viro, when we try to call prom_set_trap_table()
in the SMP trampoline code we try to take the PROM call spinlock
which doesn't work because the current thread pointer isn't
valid yet and lockdep depends upon that being correct.
Furthermore, we cannot set the current thread pointer register
because it can't be properly dereferenced until we return from
prom_set_trap_table(). Kernel TLB misses only work after that
call.
So do the PROM call to set the trap table directly instead of
going through the OBP library C code, and thus avoid the lock
altogether.
These calls are guarenteed to be serialized fully.
Since there are now no calls to the prom_set_trap_table{_sun4v}()
library functions, they can be deleted.
Signed-off-by: David S. Miller <davem@davemloft.net>
345 lines
7.7 KiB
C
345 lines
7.7 KiB
C
/* $Id: misc.c,v 1.20 2001/09/21 03:17:07 kanoj Exp $
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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 <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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/* We want to do this more nicely some day. */
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extern void (*prom_palette)(int);
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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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if (prom_palette)
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prom_palette(1);
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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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if (prom_palette)
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prom_palette(0);
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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 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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