hvmloader/ovmf: setup ovmf_info

OVMF info contains E820 map allocated by hvmloader. This info is passed
to OVMF to help it do proper initialization.

Currently only E820 is necessary, but we reserve spaces for other tables
in ovmf_info for later usage.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/tools/firmware/hvmloader/ovmf.c b/tools/firmware/hvmloader/ovmf.c
index a67a2de804508bd22145ea6e838d55ac36955af4..d50e2b2a78f2a12a8260a96b8da18a1807eec7bc 100644 (file)
--- a/tools/firmware/hvmloader/ovmf.c
+++ b/tools/firmware/hvmloader/ovmf.c
@@ -46,10 +46,54 @@
 #define LOWCHUNK_SIZE           0x00010000
 #define LOWCHUNK_MAXOFFSET      0x0000FFFF
 #define LOWCHUNK_END            (OVMF_BEGIN + OVMF_SIZE)
+#define OVMF_INFO_PHYSICAL_ADDRESS 0x00001000
 
 extern unsigned char dsdt_anycpu[];
 extern int dsdt_anycpu_len;
 
+#define OVMF_INFO_MAX_TABLES 4
+struct ovmf_info {
+    char signature[14]; /* XenHVMOVMF\0\0\0\0 */
+    uint8_t length;     /* Length of this struct */
+    uint8_t checksum;   /* Set such that the sum over bytes 0..length == 0 */
+    /*
+     * Physical address of an array of tables_nr elements.
+     *
+     * Each element is a 64 bit value containing the physical address
+     * of a BIOS table.
+     */
+    uint64_t tables;
+    uint32_t tables_nr;
+    /*
+     * Physical address of the e820 table, contains e820_nr entries.
+     */
+    uint64_t e820;
+    uint32_t e820_nr;
+} __attribute__ ((packed));
+
+static void ovmf_setup_bios_info(void)
+{
+    struct ovmf_info *info = (void *)OVMF_INFO_PHYSICAL_ADDRESS;
+
+    memset(info, 0, sizeof(*info));
+
+    memcpy(info->signature, "XenHVMOVMF", sizeof(info->signature));
+    info->length = sizeof(*info);
+}
+
+static void ovmf_finish_bios_info(void)
+{
+    struct ovmf_info *info = (void *)OVMF_INFO_PHYSICAL_ADDRESS;
+    uint32_t i;
+    uint8_t checksum;
+
+    checksum = 0;
+    for ( i = 0; i < info->length; i++ )
+        checksum += ((uint8_t *)(info))[i];
+
+    info->checksum = -checksum;
+}
+
 static void ovmf_load(const struct bios_config *config)
 {
     xen_pfn_t mfn;
@@ -104,8 +148,8 @@ struct bios_config ovmf_config =  {
 
     .load_roms = 0,
 
-    .bios_info_setup = NULL,
-    .bios_info_finish = NULL,
+    .bios_info_setup = ovmf_setup_bios_info,
+    .bios_info_finish = ovmf_finish_bios_info,
 
     .e820_setup = NULL,