Re: [Qemu-devel] [Patch] Small fix for qemu APIC for Mac OS X support

[Isaku Yamahata]

On Thu, Nov 25, 2010 at 08:18:45PM +0000, adq wrote:
> On 25 November 2010 11:28, Isaku Yamahata <address@hidden> wrote:
> > On Wed, Nov 24, 2010 at 02:08:16PM +0000, adq wrote:
> >> > Interesting. I was also thinking that maybe we can leverage overriding 
> >> > mechanisms that are already available. Maybe it's possible to squeeze 
> >> > the HPET node into an SSDT. Maybe we need to override the whole DSDT 
> >> > from the command line.
> >>
> >> We'll definitely need to override the DSDT for the applesmc device. I
> >> was thinking something along the lines of an additional DSDT binary
> >> supplied with QEMU for use when emulating apple hardware as you
> >> suggest.
> >
> > The patches for qemu and seabios have been floating around.
> > I wrote them for Q35 chipset support, but no one has gotten interested in 
> > it.
> > But now, you are there. I'm willing to rebase/resend them.
> 
> I'd definitely be interested to see those!

Here is seabios part.

>From 7a6e97b74bc0d25aca42a43cabcc68836edaf6c0 Mon Sep 17 00:00:00 2001
Message-Id: <address@hidden>
In-Reply-To: <address@hidden>
References: <address@hidden>
From: Isaku Yamahata <address@hidden>
Date: Tue, 15 Jun 2010 12:41:13 +0900
Subject: [PATCH 1/1] seabios: acpi: allow qemu to load dsdt as external acpi 
table.

allow qemu to load dsdt as external acpi table.

Signed-off-by: Isaku Yamahata <address@hidden>

---
changes v1 -> v2.
- load qemu table first and they try default dsdt table if
  qemu doesn't supply dsdt.
  Thus unnecessary malloc_high()/free() is avoided.
---
 src/acpi.c |   44 ++++++++++++++++++++++++++++++++++++--------
 1 files changed, 36 insertions(+), 8 deletions(-)

diff --git a/src/acpi.c b/src/acpi.c
index 18830dc..f4e0780 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -54,6 +54,11 @@ struct facs_descriptor_rev1
 
 
 /*
+ * Differentiated System Descrition Table (DSDT)
+ */
+#define DSDT_SIGNATURE 0x54445344 // DSDT
+
+/*
  * MADT values and structures
  */
 
@@ -221,14 +226,20 @@ static const struct pci_device_id fadt_init_tbl[] = {
     PCI_DEVICE_END
 };
 
+static void fill_dsdt(struct fadt_descriptor_rev1 *fadt, void *dsdt)
+{
+    fadt->dsdt = cpu_to_le32((u32)dsdt);
+    fadt->checksum -= checksum(fadt, sizeof(*fadt));
+    dprintf(1, "ACPI DSDT=%p\n", dsdt);
+}
+
 static void*
 build_fadt(int bdf)
 {
     struct fadt_descriptor_rev1 *fadt = malloc_high(sizeof(*fadt));
     struct facs_descriptor_rev1 *facs = memalign_high(64, sizeof(*facs));
-    void *dsdt = malloc_high(sizeof(AmlCode));
 
-    if (!fadt || !facs || !dsdt) {
+    if (!fadt || !facs) {
         warn_noalloc();
         return NULL;
     }
@@ -238,13 +249,11 @@ build_fadt(int bdf)
     facs->signature = FACS_SIGNATURE;
     facs->length = cpu_to_le32(sizeof(*facs));
 
-    /* DSDT */
-    memcpy(dsdt, AmlCode, sizeof(AmlCode));
-
     /* FADT */
     memset(fadt, 0, sizeof(*fadt));
     fadt->firmware_ctrl = cpu_to_le32((u32)facs);
-    fadt->dsdt = cpu_to_le32((u32)dsdt);
+    fadt->dsdt = 0;  /* dsdt will be filled later in acpi_bios_init()
+                        by fill_dsdt() */
     fadt->model = 1;
     fadt->reserved1 = 0;
     int pm_sci_int = pci_config_readb(bdf, PCI_INTERRUPT_LINE);
@@ -620,7 +629,8 @@ acpi_bios_init(void)
     } while(0)
 
     // Add tables
-    ACPI_INIT_TABLE(build_fadt(bdf));
+    struct fadt_descriptor_rev1 *fadt = build_fadt(bdf);
+    ACPI_INIT_TABLE(fadt);
     ACPI_INIT_TABLE(build_ssdt());
     ACPI_INIT_TABLE(build_madt());
     ACPI_INIT_TABLE(build_hpet());
@@ -635,12 +645,30 @@ acpi_bios_init(void)
             warn_noalloc();
             continue;
         }
-        ACPI_INIT_TABLE(qemu_cfg_next_acpi_table_load(addr, len));
+        struct acpi_table_header *header =
+            qemu_cfg_next_acpi_table_load(addr, len);
+        if (header->signature == DSDT_SIGNATURE) {
+            if (fadt) {
+                fill_dsdt(fadt, addr);
+            }
+        } else {
+            ACPI_INIT_TABLE(header);
+        }
         if (tbl_idx == MAX_ACPI_TABLES) {
             warn_noalloc();
             break;
         }
     }
+    if (fadt && !fadt->dsdt) {
+        /* default DSDT */
+        void *dsdt = malloc_high(sizeof(AmlCode));
+        if (!dsdt) {
+            warn_noalloc();
+            return;
+        }
+        memcpy(dsdt, AmlCode, sizeof(AmlCode));
+        fill_dsdt(fadt, dsdt);
+    }
 
     struct rsdt_descriptor_rev1 *rsdt;
     size_t rsdt_len = sizeof(*rsdt) + sizeof(u32) * tbl_idx;
-- 
1.7.1.1



-- 
yamahata