[mirror_ubuntu-hirsute-kernel.git] / arch / sparc / prom / p1275.c

// SPDX-License-Identifier: GPL-2.0
/*
 * p1275.c: Sun IEEE 1275 PROM low level interface routines
 *
 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/irqflags.h>

#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/spitfire.h>
#include <asm/pstate.h>
#include <asm/ldc.h>

struct {
	long prom_callback;			/* 0x00 */
	void (*prom_cif_handler)(long *);	/* 0x08 */
} p1275buf;

extern void prom_world(int);

extern void prom_cif_direct(unsigned long *args);
extern void prom_cif_callback(void);

/*
 * This provides SMP safety on the p1275buf.
 */
DEFINE_RAW_SPINLOCK(prom_entry_lock);

void p1275_cmd_direct(unsigned long *args)
{
	unsigned long flags;

	local_save_flags(flags);
	local_irq_restore((unsigned long)PIL_NMI);
	raw_spin_lock(&prom_entry_lock);

	prom_world(1);
	prom_cif_direct(args);
	prom_world(0);

	raw_spin_unlock(&prom_entry_lock);
	local_irq_restore(flags);
}

void prom_cif_init(void *cif_handler, void *cif_stack)
{
	p1275buf.prom_cif_handler = (void (*)(long *))cif_handler;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
b00dc837	2	/*
1da177e4 LT	3	* p1275.c: Sun IEEE 1275 PROM low level interface routines
	4	*
	5	* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	6	*/
	7
	8	#include <linux/kernel.h>
1da177e4 LT	9	#include <linux/sched.h>
	10	#include <linux/smp.h>
	11	#include <linux/string.h>
	12	#include <linux/spinlock.h>
bdcf81b6	13	#include <linux/irqflags.h>
1da177e4 LT	14
	15	#include <asm/openprom.h>
	16	#include <asm/oplib.h>
1da177e4 LT	17	#include <asm/spitfire.h>
1da177e4 LT	18	#include <asm/pstate.h>
4f0234f4	19	#include <asm/ldc.h>
1da177e4 LT	20
	21	struct {
	22	long prom_callback; /* 0x00 */
	23	void (prom_cif_handler)(long ); /* 0x08 */
1da177e4 LT	24	} p1275buf;
	25
	26	extern void prom_world(int);
	27
25edd694	28	extern void prom_cif_direct(unsigned long *args);
1da177e4 LT	29	extern void prom_cif_callback(void);
1da177e4 LT	30
1da177e4	31	/*
8a4fd1e4	32	* This provides SMP safety on the p1275buf.
1da177e4	33	*/
8a4fd1e4	34	DEFINE_RAW_SPINLOCK(prom_entry_lock);
1da177e4	35
25edd694	36	void p1275_cmd_direct(unsigned long *args)
1da177e4	37	{
1da177e4	38	unsigned long flags;
1da177e4	39
bdcf81b6 DM	40	local_save_flags(flags);
bdcf81b6 DM	41	local_irq_restore((unsigned long)PIL_NMI);
8a4fd1e4	42	raw_spin_lock(&prom_entry_lock);
1da177e4	43
1da177e4	44	prom_world(1);
25edd694	45	prom_cif_direct(args);
1da177e4 LT	46	prom_world(0);
1da177e4 LT	47
8a4fd1e4	48	raw_spin_unlock(&prom_entry_lock);
bdcf81b6	49	local_irq_restore(flags);
1da177e4 LT	50	}
	51
	52	void prom_cif_init(void cif_handler, void cif_stack)
	53	{
	54	p1275buf.prom_cif_handler = (void ()(long ))cif_handler;
1da177e4	55	}