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[PATCH 3/6] Probe watch registers and report configuration.

To: linux-mips@linux-mips.org
Subject: [PATCH 3/6] Probe watch registers and report configuration.
From: David Daney <ddaney@avtrex.com>
Date: Mon, 28 Apr 2008 18:33:24 -0700
Cc: Linux kernel <linux-kernel@vger.kernel.org>
In-reply-to: <48167832.3090103@avtrex.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <48167832.3090103@avtrex.com>
Sender: linux-mips-bounce@linux-mips.org
User-agent: Thunderbird 2.0.0.12 (X11/20080226)
Probe watch registers and report configuration.

Probe for watch register characteristics, and report them in /proc/cpuinfo.

Signed-off-by: David Daney <ddaney@avtrex.com>
---
arch/mips/kernel/cpu-probe.c |    4 ++++
arch/mips/kernel/proc.c      |   10 ++++++++++
2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index 89c3304..1563049 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -21,6 +21,7 @@
#include <asm/fpu.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
+#include <asm/watch.h>

/*
 * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
@@ -678,6 +679,9 @@ static void __cpuinit decode_configs(struct cpuinfo_mips *c)
static inline void cpu_probe_mips(struct cpuinfo_mips *c)
{
        decode_configs(c);
+#if defined(CONFIG_HARDWARE_WATCHPOINTS)
+       mips_probe_watch_registers(c);
+#endif
        switch (c->processor_id & 0xff00) {
        case PRID_IMP_4KC:
                c->cputype = CPU_4KC;
diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index 36f0653..e2f716c 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -50,8 +50,18 @@ static int show_cpuinfo(struct seq_file *m, void *v)
        seq_printf(m, "tlb_entries\t\t: %d\n", cpu_data[n].tlbsize);
        seq_printf(m, "extra interrupt vector\t: %s\n",
                      cpu_has_divec ? "yes" : "no");
+#ifdef CONFIG_HARDWARE_WATCHPOINTS
+       seq_printf(m, "hardware watchpoint\t: %s",
+                  cpu_has_watch ? "yes" : "no\n");
+       if (cpu_has_watch)
+               seq_printf(m, ", count: %d, address mask: 0x%04x, irw mask 
0x%02x\n",
+                          cpu_data[n].watch_reg_count,
+                          cpu_data[n].watch_reg_mask,
+                          cpu_data[n].watch_reg_irw);
+#else
        seq_printf(m, "hardware watchpoint\t: %s\n",
                      cpu_has_watch ? "yes" : "no");
+#endif
        seq_printf(m, "ASEs implemented\t:%s%s%s%s%s%s\n",
                      cpu_has_mips16 ? " mips16" : "",
                      cpu_has_mdmx ? " mdmx" : "",
--
1.5.5


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