Patch set updated for coreboot: src/console: Add x86 romstage spinlock option and printk spinlock support

[Timothy Pearson]

Timothy Pearson ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/11958

-gerrit

commit d5b63abf9819dd43467d73796a649e9831da2b83
Author: Timothy Pearson 
Date:   Mon May 18 16:04:10 2015 -0500

src/console: Add x86 romstage spinlock option and printk spinlock support

This paves the way for AP printk spinlock on AMD platforms

Change-Id: Ice42a0d3177736bf6e1bc601092e413601866f20
    Signed-off-by: Timothy Pearson 
---
 src/Kconfig                              |  4 ++++
 src/arch/x86/include/arch/smp/spinlock.h | 11 ++++++++++-
 src/console/printk.c                     | 19 +++++++++++++++++++
 src/cpu/amd/car/post_cache_as_ram.c      |  4 ++++
 4 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/Kconfig b/src/Kconfig
index 3b7a249..1771c85 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -463,6 +463,10 @@ config HAVE_HARD_RESET
      This variable specifies whether a given board has a hard_reset
      function, no matter if it's provided by board code or chipset code.

+config HAVE_ROMSTAGE_CONSOLE_SPINLOCK
+	bool
+	default n
+
 config HAVE_MONOTONIC_TIMER
    def_bool n
    help
diff --git a/src/arch/x86/include/arch/smp/spinlock.h b/src/arch/x86/include/arch/smp/spinlock.h
index 32be2f2..3283540 100644
--- a/src/arch/x86/include/arch/smp/spinlock.h
+++ b/src/arch/x86/include/arch/smp/spinlock.h
@@ -1,7 +1,7 @@
 #ifndef ARCH_SMP_SPINLOCK_H
 #define ARCH_SMP_SPINLOCK_H

-#ifndef __PRE_RAM__
+#if !defined(__PRE_RAM__) || defined(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK)

/*
  * Your basic SMP spinlocks, allowing only a single CPU anywhere
@@ -11,9 +11,18 @@ typedef struct {
    volatile unsigned int lock;
 } spinlock_t;

+#ifdef __PRE_RAM__
+spinlock_t *romstage_console_lock(void);
+void initialize_romstage_console_lock(void);
+#endif

#define SPIN_LOCK_UNLOCKED (spinlock_t) { 1 }
+
+#ifndef __PRE_RAM__
 #define DECLARE_SPIN_LOCK(x) static spinlock_t x = SPIN_LOCK_UNLOCKED;
+#else
+#define DECLARE_SPIN_LOCK(x)
+#endif

/*
  * Simple spin lock operations.  There are two variants, one clears IRQ's
diff --git a/src/console/printk.c b/src/console/printk.c
index aab7ff5..5a23db0 100644
--- a/src/console/printk.c
+++ b/src/console/printk.c
@@ -2,6 +2,7 @@
  *  blatantly copied from linux/kernel/printk.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 2015 Timothy Pearson , Raptor Engineering
  *
  */

@@ -13,7 +14,13 @@
 #include <stddef.h>
 #include <trace.h>

+#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK)
+#ifndef __PRE_RAM__
 DECLARE_SPIN_LOCK(console_lock)
+#endif
+#else
+DECLARE_SPIN_LOCK(console_lock)
+#endif

void do_putchar(unsigned char byte)
 {
@@ -39,7 +46,13 @@ int do_printk(int msg_level, const char *fmt, ...)
 #endif

DISABLE_TRACE;
+#ifdef __PRE_RAM__
+#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK)
+	spin_lock(romstage_console_lock());
+#endif
+#else
    spin_lock(&console_lock);
+#endif

va_start(args, fmt);
    i = vtxprintf(wrap_putchar, fmt, args, NULL);
@@ -47,7 +60,13 @@ int do_printk(int msg_level, const char *fmt, ...)

console_tx_flush();

+#ifdef __PRE_RAM__
+#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK)
+	spin_unlock(romstage_console_lock());
+#endif
+#else
    spin_unlock(&console_lock);
+#endif
    ENABLE_TRACE;

return i;
diff --git a/src/cpu/amd/car/post_cache_as_ram.c b/src/cpu/amd/car/post_cache_as_ram.c
index 61d47a2..4102a66 100644
--- a/src/cpu/amd/car/post_cache_as_ram.c
+++ b/src/cpu/amd/car/post_cache_as_ram.c
@@ -76,6 +76,10 @@ static void prepare_ramstage_region(void *resume_backup_memory)
    	memset_((void*)0, 0, CONFIG_RAMTOP - backup_top);
    }

+#if IS_ENABLED(CONFIG_HAVE_ROMSTAGE_CONSOLE_SPINLOCK)
+	initialize_romstage_console_lock();
+#endif
+
    print_car_debug("Done\n");
 }