[Qemu-devel] [PATCH 02/12] Implement cpu_physical_memory_set()

[Benjamin Herrenschmidt]

From: David Gibson <da...@gibson.dropbear.id.au>

This patch adds cpu_physical_memory_set() function.  This is equivalent to
calling cpu_physical_memory_write() with a buffer filled with a character,
ie, a memset of target memory.

It uses a small temporary buffer on the stack.

Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
---
 cpu-common.h |    1 +
 exec.c       |   15 +++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/cpu-common.h b/cpu-common.h
index dca5175..be6b9f3 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -53,6 +53,7 @@ void qemu_ram_set_idstr(ram_addr_t addr, const char *name, 
DeviceState *dev);
 
 void cpu_physical_memory_rw(target_phys_addr_t addr, uint8_t *buf,
                             int len, int is_write);
+void cpu_physical_memory_set(target_phys_addr_t addr, uint8_t c, int len);
 static inline void cpu_physical_memory_read(target_phys_addr_t addr,
                                             void *buf, int len)
 {
diff --git a/exec.c b/exec.c
index 0607c9b..40cf52d 100644
--- a/exec.c
+++ b/exec.c
@@ -3581,6 +3581,21 @@ void cpu_physical_memory_rw(target_phys_addr_t addr, 
uint8_t *buf,
     }
 }
 
+void cpu_physical_memory_set(target_phys_addr_t addr, uint8_t c, int len)
+{
+#define FILLBUF_SIZE 512
+    uint8_t fillbuf[FILLBUF_SIZE];
+    int l;
+
+    memset(fillbuf, c, FILLBUF_SIZE);
+    while (len > 0) {
+        l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE;
+        cpu_physical_memory_rw(addr, fillbuf, l, true);
+        len -= len;
+        addr += len;
+    }
+}
+
 /* used for ROM loading : can write in RAM and ROM */
 void cpu_physical_memory_write_rom(target_phys_addr_t addr,
                                    const uint8_t *buf, int len)
-- 
1.7.9.5