fw_cfg: add "modify" functions for all types

This allows to alter the contents of an already added item.

Signed-off-by: Sergio Lopez <slp@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 7dc3ac378e..aef1727250 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -690,6 +690,15 @@ void fw_cfg_add_string(FWCfgState *s, uint16_t key, const char *value)
     fw_cfg_add_bytes(s, key, g_memdup(value, sz), sz);
 }
 
+void fw_cfg_modify_string(FWCfgState *s, uint16_t key, const char *value)
+{
+    size_t sz = strlen(value) + 1;
+    char *old;
+
+    old = fw_cfg_modify_bytes_read(s, key, g_memdup(value, sz), sz);
+    g_free(old);
+}
+
 void fw_cfg_add_i16(FWCfgState *s, uint16_t key, uint16_t value)
 {
     uint16_t *copy;
@@ -720,6 +729,16 @@ void fw_cfg_add_i32(FWCfgState *s, uint16_t key, uint32_t value)
     fw_cfg_add_bytes(s, key, copy, sizeof(value));
 }
 
+void fw_cfg_modify_i32(FWCfgState *s, uint16_t key, uint32_t value)
+{
+    uint32_t *copy, *old;
+
+    copy = g_malloc(sizeof(value));
+    *copy = cpu_to_le32(value);
+    old = fw_cfg_modify_bytes_read(s, key, copy, sizeof(value));
+    g_free(old);
+}
+
 void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
 {
     uint64_t *copy;
@@ -730,6 +749,16 @@ void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
     fw_cfg_add_bytes(s, key, copy, sizeof(value));
 }
 
+void fw_cfg_modify_i64(FWCfgState *s, uint16_t key, uint64_t value)
+{
+    uint64_t *copy, *old;
+
+    copy = g_malloc(sizeof(value));
+    *copy = cpu_to_le64(value);
+    old = fw_cfg_modify_bytes_read(s, key, copy, sizeof(value));
+    g_free(old);
+}
+
 void fw_cfg_set_order_override(FWCfgState *s, int order)
 {
     assert(s->fw_cfg_order_override == 0);