25edd6946a
This is based upon a report by Meelis Roos showing that it's possible that we'll try to fetch a property that is 32K in size with some devices. With the current fixed 3K buffer we use for moving data in and out of the firmware during PROM calls, that simply won't work. In fact, it will scramble random kernel data during bootup. The reasoning behind the temporary buffer is entirely historical. It used to be the case that we had problems referencing dynamic kernel memory (including the stack) early in the boot process before we explicitly told the firwmare to switch us over to the kernel trap table. So what we did was always give the firmware buffers that were locked into the main kernel image. But we no longer have problems like that, so get rid of all of this indirect bounce buffering. Besides fixing Meelis's bug, this also makes the kernel data about 3K smaller. It was also discovered during these conversions that the implementation of prom_retain() was completely wrong, so that was fixed here as well. Currently that interface is not in use. Reported-by: Meelis Roos <mroos@linux.ee> Tested-by: Meelis Roos <mroos@linux.ee> Signed-off-by: David S. Miller <davem@davemloft.net>
465 lines
9.2 KiB
C
465 lines
9.2 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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unsigned long args[5];
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args[0] = (unsigned long) "test";
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args[1] = 1;
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args[2] = 1;
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args[3] = (unsigned long) service_name;
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args[4] = (unsigned long) -1;
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p1275_cmd_direct(args);
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if (args[4])
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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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unsigned long args[3];
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if (!prom_service_exists(svc))
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return;
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args[0] = (unsigned long) svc;
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args[1] = 0;
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args[2] = 0;
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p1275_cmd_direct(args);
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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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unsigned long args[4];
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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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args[0] = (unsigned long) "boot";
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args[1] = 1;
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args[2] = 0;
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args[3] = (unsigned long) bcommand;
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p1275_cmd_direct(args);
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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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unsigned long args[5];
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if (!fstring || fstring[0] == 0)
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return;
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args[0] = (unsigned long) "interpret";
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args[1] = 1;
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args[2] = 1;
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args[3] = (unsigned long) fstring;
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args[4] = (unsigned long) -1;
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p1275_cmd_direct(args);
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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 args[3];
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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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args[0] = (unsigned long) "enter";
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args[1] = 0;
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args[2] = 0;
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p1275_cmd_direct(args);
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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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unsigned long args[3];
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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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args[0] = (unsigned long) "exit";
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args[1] = 0;
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args[2] = 0;
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p1275_cmd_direct(args);
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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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unsigned long args[3];
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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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args[0] = (unsigned long) "SUNW,power-off";
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args[1] = 0;
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args[2] = 0;
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p1275_cmd_direct(args);
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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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unsigned long args[5];
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if (!funcp)
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return;
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args[0] = (unsigned long) "set-callback";
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args[1] = 1;
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args[2] = 1;
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args[3] = (unsigned long) funcp;
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args[4] = (unsigned long) -1;
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p1275_cmd_direct(args);
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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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static long tlb_load(const char *type, unsigned long index,
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unsigned long tte_data, unsigned long vaddr)
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{
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unsigned long args[9];
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args[0] = (unsigned long) prom_callmethod_name;
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args[1] = 5;
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args[2] = 1;
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args[3] = (unsigned long) type;
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args[4] = (unsigned int) prom_get_mmu_ihandle();
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args[5] = vaddr;
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args[6] = tte_data;
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args[7] = index;
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args[8] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (long) args[8];
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}
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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 tlb_load("SUNW,itlb-load", index, tte_data, vaddr);
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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 tlb_load("SUNW,dtlb-load", index, tte_data, vaddr);
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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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unsigned long args[11];
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int ret;
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args[0] = (unsigned long) prom_callmethod_name;
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args[1] = 7;
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args[2] = 1;
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args[3] = (unsigned long) prom_map_name;
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args[4] = (unsigned int) prom_get_mmu_ihandle();
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args[5] = (unsigned int) mode;
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args[6] = size;
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args[7] = vaddr;
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args[8] = 0;
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args[9] = paddr;
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args[10] = (unsigned long) -1;
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p1275_cmd_direct(args);
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ret = (int) args[10];
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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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unsigned long args[7];
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args[0] = (unsigned long) prom_callmethod_name;
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args[1] = 4;
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args[2] = 0;
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args[3] = (unsigned long) prom_unmap_name;
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args[4] = (unsigned int) prom_get_mmu_ihandle();
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args[5] = size;
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args[6] = vaddr;
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p1275_cmd_direct(args);
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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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int prom_retain(const char *name, unsigned long size,
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unsigned long align, unsigned long *paddr)
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{
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unsigned long args[11];
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args[0] = (unsigned long) prom_callmethod_name;
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args[1] = 5;
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args[2] = 3;
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args[3] = (unsigned long) "SUNW,retain";
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args[4] = (unsigned int) prom_get_memory_ihandle();
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args[5] = align;
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args[6] = size;
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args[7] = (unsigned long) name;
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args[8] = (unsigned long) -1;
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args[9] = (unsigned long) -1;
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args[10] = (unsigned long) -1;
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p1275_cmd_direct(args);
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if (args[8])
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return (int) args[8];
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/* Next we get "phys_high" then "phys_low". On 64-bit
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* the phys_high cell is don't care since the phys_low
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* cell has the full value.
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*/
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*paddr = args[10];
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return 0;
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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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unsigned long args[12];
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args[0] = (unsigned long) prom_callmethod_name;
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args[1] = 7;
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args[2] = 2;
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args[3] = (unsigned long) "SUNW,get-unumber";
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args[4] = (unsigned int) prom_get_memory_ihandle();
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args[5] = buflen;
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args[6] = (unsigned long) buf;
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args[7] = 0;
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args[8] = phys_addr;
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args[9] = (unsigned int) syndrome_code;
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args[10] = (unsigned long) -1;
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args[11] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[10];
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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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unsigned long args[3];
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args[0] = (unsigned long) "SUNW,sleep-self";
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args[1] = 0;
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args[2] = 0;
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p1275_cmd_direct(args);
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}
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int prom_sleepsystem(void)
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{
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unsigned long args[4];
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args[0] = (unsigned long) "SUNW,sleep-system";
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args[1] = 0;
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args[2] = 1;
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args[3] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[3];
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}
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int prom_wakeupsystem(void)
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{
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unsigned long args[4];
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args[0] = (unsigned long) "SUNW,wakeup-system";
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args[1] = 0;
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args[2] = 1;
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args[3] = (unsigned long) -1;
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p1275_cmd_direct(args);
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return (int) args[3];
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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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unsigned long args[6];
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args[0] = (unsigned long) "SUNW,start-cpu";
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args[1] = 3;
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args[2] = 0;
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args[3] = (unsigned int) cpunode;
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args[4] = pc;
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args[5] = arg;
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p1275_cmd_direct(args);
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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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unsigned long args[6];
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args[0] = (unsigned long) "SUNW,start-cpu-by-cpuid";
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args[1] = 3;
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args[2] = 0;
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args[3] = (unsigned int) cpuid;
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args[4] = pc;
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args[5] = arg;
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p1275_cmd_direct(args);
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}
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void prom_stopcpu_cpuid(int cpuid)
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{
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unsigned long args[4];
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args[0] = (unsigned long) "SUNW,stop-cpu-by-cpuid";
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args[1] = 1;
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args[2] = 0;
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args[3] = (unsigned int) cpuid;
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p1275_cmd_direct(args);
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}
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void prom_stopself(void)
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{
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unsigned long args[3];
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args[0] = (unsigned long) "SUNW,stop-self";
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args[1] = 0;
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args[2] = 0;
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p1275_cmd_direct(args);
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}
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void prom_idleself(void)
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{
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unsigned long args[3];
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args[0] = (unsigned long) "SUNW,idle-self";
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args[1] = 0;
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args[2] = 0;
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p1275_cmd_direct(args);
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}
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void prom_resumecpu(int cpunode)
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{
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unsigned long args[4];
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args[0] = (unsigned long) "SUNW,resume-cpu";
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args[1] = 1;
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args[2] = 0;
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args[3] = (unsigned int) cpunode;
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p1275_cmd_direct(args);
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}
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#endif
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