mirror of https://gitee.com/openkylin/linux.git
152 lines
3.7 KiB
C
152 lines
3.7 KiB
C
/*
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* p1275.c: Sun IEEE 1275 PROM low level interface routines
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*
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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/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/string.h>
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#include <linux/spinlock.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/spitfire.h>
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#include <asm/pstate.h>
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#include <asm/ldc.h>
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struct {
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long prom_callback; /* 0x00 */
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void (*prom_cif_handler)(long *); /* 0x08 */
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unsigned long prom_cif_stack; /* 0x10 */
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unsigned long prom_args [23]; /* 0x18 */
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char prom_buffer [3000];
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} p1275buf;
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extern void prom_world(int);
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extern void prom_cif_interface(void);
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extern void prom_cif_callback(void);
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/*
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* This provides SMP safety on the p1275buf. prom_callback() drops this lock
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* to allow recursuve acquisition.
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*/
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DEFINE_SPINLOCK(prom_entry_lock);
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long p1275_cmd(const char *service, long fmt, ...)
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{
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char *p, *q;
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unsigned long flags;
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int nargs, nrets, i;
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va_list list;
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long attrs, x;
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p = p1275buf.prom_buffer;
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spin_lock_irqsave(&prom_entry_lock, flags);
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p1275buf.prom_args[0] = (unsigned long)p; /* service */
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strcpy (p, service);
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p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
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p1275buf.prom_args[1] = nargs = (fmt & 0x0f); /* nargs */
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p1275buf.prom_args[2] = nrets = ((fmt & 0xf0) >> 4); /* nrets */
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attrs = fmt >> 8;
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va_start(list, fmt);
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for (i = 0; i < nargs; i++, attrs >>= 3) {
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switch (attrs & 0x7) {
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case P1275_ARG_NUMBER:
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p1275buf.prom_args[i + 3] =
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(unsigned)va_arg(list, long);
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break;
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case P1275_ARG_IN_64B:
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p1275buf.prom_args[i + 3] =
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va_arg(list, unsigned long);
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break;
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case P1275_ARG_IN_STRING:
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strcpy (p, va_arg(list, char *));
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p1275buf.prom_args[i + 3] = (unsigned long)p;
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p = (char *)(((long)(strchr (p, 0) + 8)) & ~7);
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break;
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case P1275_ARG_OUT_BUF:
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(void) va_arg(list, char *);
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p1275buf.prom_args[i + 3] = (unsigned long)p;
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x = va_arg(list, long);
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i++; attrs >>= 3;
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p = (char *)(((long)(p + (int)x + 7)) & ~7);
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p1275buf.prom_args[i + 3] = x;
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break;
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case P1275_ARG_IN_BUF:
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q = va_arg(list, char *);
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p1275buf.prom_args[i + 3] = (unsigned long)p;
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x = va_arg(list, long);
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i++; attrs >>= 3;
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memcpy (p, q, (int)x);
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p = (char *)(((long)(p + (int)x + 7)) & ~7);
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p1275buf.prom_args[i + 3] = x;
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break;
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case P1275_ARG_OUT_32B:
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(void) va_arg(list, char *);
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p1275buf.prom_args[i + 3] = (unsigned long)p;
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p += 32;
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break;
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case P1275_ARG_IN_FUNCTION:
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p1275buf.prom_args[i + 3] =
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(unsigned long)prom_cif_callback;
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p1275buf.prom_callback = va_arg(list, long);
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break;
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}
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}
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va_end(list);
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prom_world(1);
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prom_cif_interface();
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prom_world(0);
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attrs = fmt >> 8;
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va_start(list, fmt);
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for (i = 0; i < nargs; i++, attrs >>= 3) {
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switch (attrs & 0x7) {
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case P1275_ARG_NUMBER:
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(void) va_arg(list, long);
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break;
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case P1275_ARG_IN_STRING:
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(void) va_arg(list, char *);
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break;
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case P1275_ARG_IN_FUNCTION:
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(void) va_arg(list, long);
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break;
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case P1275_ARG_IN_BUF:
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(void) va_arg(list, char *);
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(void) va_arg(list, long);
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i++; attrs >>= 3;
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break;
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case P1275_ARG_OUT_BUF:
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p = va_arg(list, char *);
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x = va_arg(list, long);
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memcpy (p, (char *)(p1275buf.prom_args[i + 3]), (int)x);
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i++; attrs >>= 3;
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break;
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case P1275_ARG_OUT_32B:
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p = va_arg(list, char *);
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memcpy (p, (char *)(p1275buf.prom_args[i + 3]), 32);
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break;
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}
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}
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va_end(list);
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x = p1275buf.prom_args [nargs + 3];
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spin_unlock_irqrestore(&prom_entry_lock, flags);
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return x;
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}
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void prom_cif_init(void *cif_handler, void *cif_stack)
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{
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p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
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p1275buf.prom_cif_stack = (unsigned long)cif_stack;
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}
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