patch-2.4.19 linux-2.4.19/arch/mips/sibyte/sb1250/smp.c

• Lines: 85
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips/sibyte/sb1250/smp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/mips/sibyte/sb1250/smp.c linux-2.4.19/arch/mips/sibyte/sb1250/smp.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2001 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <asm/sibyte/64bit.h>
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/addrspace.h>
+#include <asm/smp.h>
+#include <linux/sched.h>
+
+/*
+ * These are routines for dealing with the sb1250 smp capabilities
+ * independent of board/firmware
+ */
+
+static u64 mailbox_set_regs[] = {
+	KSEG1 + A_IMR_CPU0_BASE + R_IMR_MAILBOX_SET_CPU, 
+	KSEG1 + A_IMR_CPU1_BASE + R_IMR_MAILBOX_SET_CPU
+};
+
+static u64 mailbox_clear_regs[] = {
+	KSEG1 + A_IMR_CPU0_BASE + R_IMR_MAILBOX_CLR_CPU, 
+	KSEG1 + A_IMR_CPU1_BASE + R_IMR_MAILBOX_CLR_CPU
+};
+
+static u64 mailbox_regs[] = {
+	KSEG1 + A_IMR_CPU0_BASE + R_IMR_MAILBOX_CPU, 
+	KSEG1 + A_IMR_CPU1_BASE + R_IMR_MAILBOX_CPU
+};
+
+
+/*
+ * Simple enough; everything is set up, so just poke the appropriate mailbox
+ * register, and we should be set
+ */
+void core_send_ipi(int cpu, unsigned int action)
+{
+	out64((((u64)action)<< 48), mailbox_set_regs[cpu]);
+}
+
+
+void sb1250_smp_finish(void)
+{
+	extern void sb1_sanitize_tlb(void);
+
+	sb1_sanitize_tlb();
+	sb1250_time_init();
+}
+
+void sb1250_mailbox_interrupt(struct pt_regs *regs)
+{
+	int cpu = smp_processor_id();
+	unsigned int action;
+	
+	/* Load the mailbox register to figure out what we're supposed to do */
+	action = (in64(mailbox_regs[cpu]) >> 48) & 0xffff;
+
+	/* Clear the mailbox to clear the interrupt */
+	out64(((u64)action)<<48, mailbox_clear_regs[cpu]);
+
+	/*
+	 * Nothing to do for SMP_RESCHEDULE_YOURSELF; returning from the
+	 * interrupt will do the reschedule for us
+	 */
+
+	if (action & SMP_CALL_FUNCTION) {
+		smp_call_function_interrupt();
+	}
+}