[Qemu-devel] [PATCH 6/9] pc: acpi: use build_append_foo() API to construct FADT

[Igor Mammedov <imammedo@redhat.com>]

build_append_foo() API doesn't need explicit endianness
conversions which eliminates a source of errors and
it makes build_fadt() look like declarative definition of
FADT table in ACPI spec, which makes it easy to review.
Also it allows easily extending FADT to support other
revisions which will be used by follow up patches
where build_fadt() will be reused for ARM target.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/i386/acpi-build.c | 147 +++++++++++++++++++++++++++++----------------------
 1 file changed, 85 insertions(+), 62 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 706ba35..544a4bc 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -299,87 +299,110 @@ build_facs(GArray *table_data, BIOSLinker *linker)
     facs->length = cpu_to_le32(sizeof(*facs));
 }
 
-/* Load chipset information in FADT */
-static void fadt_setup(AcpiFadtDescriptorRev3 *fadt, AcpiFadtData f)
-{
-    fadt->model = f.int_model;
-    fadt->reserved1 = 0;
-    fadt->sci_int = cpu_to_le16(f.sci_int);
-    fadt->smi_cmd = cpu_to_le32(f.smi_cmd);
-    fadt->acpi_enable = f.acpi_enable_cmd;
-    fadt->acpi_disable = f.acpi_disable_cmd;
-    /* EVT, CNT, TMR offset matches hw/acpi/core.c */
-    fadt->pm1a_evt_blk = cpu_to_le32(f.pm1_evt.address);
-    fadt->pm1a_cnt_blk = cpu_to_le32(f.pm1_cnt.address);
-    fadt->pm_tmr_blk = cpu_to_le32(f.pm_tmr.address);
-    fadt->gpe0_blk = cpu_to_le32(f.gpe0_blk.address);
-    /* EVT, CNT, TMR length matches hw/acpi/core.c */
-    fadt->pm1_evt_len = f.pm1_evt.bit_width / 8;
-    fadt->pm1_cnt_len = f.pm1_cnt.bit_width / 8;
-    fadt->pm_tmr_len = f.pm_tmr.bit_width / 8;
-    fadt->gpe0_blk_len = f.gpe0_blk.bit_width / 8;
-    fadt->plvl2_lat = cpu_to_le16(f.c2_latency);
-    fadt->plvl3_lat = cpu_to_le16(f.c3_latency);
-    fadt->flags = cpu_to_le32(f.flags);
-    fadt->century = f.rtc_century;
-    if (f.rev == 1) {
-        return;
-    }
-
-    fadt->reset_value = f.reset_val;
-    fadt->reset_register = f.reset_reg;
-    fadt->reset_register.address = cpu_to_le64(f.reset_reg.address);
-
-    fadt->xpm1a_event_block = f.pm1_evt;
-    fadt->xpm1a_event_block.address = cpu_to_le64(f.pm1_evt.address);
-
-    fadt->xpm1a_control_block = f.pm1_cnt;
-    fadt->xpm1a_control_block.address = cpu_to_le64(f.pm1_cnt.address);
-
-    fadt->xpm_timer_block = f.pm_tmr;
-    fadt->xpm_timer_block.address = cpu_to_le64(f.pm_tmr.address);
-
-    fadt->xgpe0_block = f.gpe0_blk;
-    fadt->xgpe0_block.address = cpu_to_le64(f.gpe0_blk.address);
-}
-
-
 /* FADT */
 static void
-build_fadt(GArray *table_data, BIOSLinker *linker, AcpiFadtData *f,
+build_fadt(GArray *tbl, BIOSLinker *linker, AcpiFadtData *f,
            const char *oem_id, const char *oem_table_id)
 {
-    AcpiFadtDescriptorRev3 *fadt = acpi_data_push(table_data, sizeof(*fadt));
-    unsigned fw_ctrl_offset = (char *)&fadt->firmware_ctrl - table_data->data;
-    unsigned dsdt_entry_offset = (char *)&fadt->dsdt - table_data->data;
-    unsigned xdsdt_entry_offset = (char *)&fadt->x_dsdt - table_data->data;
-    int fadt_size = sizeof(*fadt);
+    int off;
+    int fadt_start = tbl->len;
+
+    acpi_data_push(tbl, sizeof(AcpiTableHeader));
 
-    /* FACS address to be filled by Guest linker */
+    /* FACS address to be filled by Guest linker at runtime */
+    off = tbl->len;
+    build_append_int_noprefix(tbl, 0, 4); /* FIRMWARE_CTRL */
     if (f->facs_tbl_offset) {
         bios_linker_loader_add_pointer(linker,
-            ACPI_BUILD_TABLE_FILE, fw_ctrl_offset, sizeof(fadt->firmware_ctrl),
+            ACPI_BUILD_TABLE_FILE, off, 4,
             ACPI_BUILD_TABLE_FILE, *f->facs_tbl_offset);
     }
 
-    /* DSDT address to be filled by Guest linker */
-    fadt_setup(fadt, *f);
+    /* DSDT address to be filled by Guest linker at runtime */
+    off = tbl->len;
+    build_append_int_noprefix(tbl, 0, 4); /* DSDT */
     if (f->dsdt_tbl_offset) {
         bios_linker_loader_add_pointer(linker,
-            ACPI_BUILD_TABLE_FILE, dsdt_entry_offset, sizeof(fadt->dsdt),
+            ACPI_BUILD_TABLE_FILE, off, 4,
             ACPI_BUILD_TABLE_FILE, *f->dsdt_tbl_offset);
     }
+
+    /* ACPI1.0: INT_MODEL, ACPI2.0+: Reserved */
+    build_append_int_noprefix(tbl, f->int_model /* Multiple APIC */, 1);
+    /* Preferred_PM_Profile */
+    build_append_int_noprefix(tbl, 0 /* Unspecified */, 1);
+    build_append_int_noprefix(tbl, f->sci_int, 2); /* SCI_INT */
+    build_append_int_noprefix(tbl, f->smi_cmd, 4); /* SMI_CMD */
+    build_append_int_noprefix(tbl, f->acpi_enable_cmd, 1); /* ACPI_ENABLE */
+    build_append_int_noprefix(tbl, f->acpi_disable_cmd, 1); /* ACPI_DISABLE */
+    build_append_int_noprefix(tbl, 0 /* not supported */, 1); /* S4BIOS_REQ */
+    /* ACPI1.0: Reserved, ACPI2.0+: PSTATE_CNT */
+    build_append_int_noprefix(tbl, 0, 1);
+    build_append_int_noprefix(tbl, f->pm1_evt.address, 4); /* PM1a_EVT_BLK */
+    build_append_int_noprefix(tbl, 0, 4); /* PM1b_EVT_BLK */
+    build_append_int_noprefix(tbl, f->pm1_cnt.address, 4); /* PM1a_CNT_BLK */
+    build_append_int_noprefix(tbl, 0, 4); /* PM1b_CNT_BLK */
+    build_append_int_noprefix(tbl, 0, 4); /* PM2_CNT_BLK */
+    build_append_int_noprefix(tbl, f->pm_tmr.address, 4); /* PM_TMR_BLK */
+    build_append_int_noprefix(tbl, f->gpe0_blk.address, 4); /* GPE0_BLK */
+    build_append_int_noprefix(tbl, 0, 4); /* GPE1_BLK */
+    /* PM1_EVT_LEN */
+    build_append_int_noprefix(tbl, f->pm1_evt.bit_width / 8, 1);
+    /* PM1_CNT_LEN */
+    build_append_int_noprefix(tbl, f->pm1_cnt.bit_width / 8, 1);
+    build_append_int_noprefix(tbl, 0, 1); /* PM2_CNT_LEN */
+    build_append_int_noprefix(tbl, f->pm_tmr.bit_width / 8, 1); /* PM_TMR_LEN */
+    /* GPE0_BLK_LEN */
+    build_append_int_noprefix(tbl, f->gpe0_blk.bit_width / 8, 1);
+    build_append_int_noprefix(tbl, 0, 1); /* GPE1_BLK_LEN */
+    build_append_int_noprefix(tbl, 0, 1); /* GPE1_BASE */
+    build_append_int_noprefix(tbl, 0, 1); /* CST_CNT */
+    build_append_int_noprefix(tbl, f->c2_latency, 2); /* P_LVL2_LAT */
+    build_append_int_noprefix(tbl, f->c3_latency, 2); /* P_LVL3_LAT */
+    build_append_int_noprefix(tbl, 0, 2); /* FLUSH_SIZE */
+    build_append_int_noprefix(tbl, 0, 2); /* FLUSH_STRIDE */
+    build_append_int_noprefix(tbl, 0, 1); /* DUTY_OFFSET */
+    build_append_int_noprefix(tbl, 0, 1); /* DUTY_WIDTH */
+    build_append_int_noprefix(tbl, 0, 1); /* DAY_ALRM */
+    build_append_int_noprefix(tbl, 0, 1); /* MON_ALRM */
+    build_append_int_noprefix(tbl, f->rtc_century, 1); /* CENTURY */
+    build_append_int_noprefix(tbl, 0, 2); /* IAPC_BOOT_ARCH */
+    build_append_int_noprefix(tbl, 0, 1); /* Reserved */
+    build_append_int_noprefix(tbl, f->flags, 4); /* Flags */
+
     if (f->rev == 1) {
-        fadt_size = offsetof(typeof(*fadt), reset_register);
-    } else if (f->xdsdt_tbl_offset) {
+        goto build_hdr;
+    }
+
+    build_append_gas_from_struct(tbl, &f->reset_reg); /* RESET_REG */
+    build_append_int_noprefix(tbl, f->reset_val, 1); /* RESET_VALUE */
+    build_append_int_noprefix(tbl, 0, 3); /* Reserved, ACPI 3.0 */
+    build_append_int_noprefix(tbl, 0, 8); /* X_FIRMWARE_CTRL */
+
+    /* XDSDT address to be filled by Guest linker at runtime */
+    off = tbl->len;
+    build_append_int_noprefix(tbl, 0, 8); /* X_DSDT */
+    if (f->xdsdt_tbl_offset) {
         bios_linker_loader_add_pointer(linker,
-            ACPI_BUILD_TABLE_FILE, xdsdt_entry_offset, sizeof(fadt->x_dsdt),
+            ACPI_BUILD_TABLE_FILE, off, 8,
             ACPI_BUILD_TABLE_FILE, *f->xdsdt_tbl_offset);
     }
 
-    build_header(linker, table_data,
-                (void *)fadt, "FACP", fadt_size, f->rev,
-                oem_id, oem_table_id);
+    build_append_gas_from_struct(tbl, &f->pm1_evt); /* X_PM1a_EVT_BLK */
+    /* X_PM1b_EVT_BLK */
+    build_append_gas(tbl, AML_AS_SYSTEM_MEMORY, 0 , 0, 0, 0);
+    build_append_gas_from_struct(tbl, &f->pm1_cnt); /* X_PM1a_CNT_BLK */
+    /* X_PM1b_CNT_BLK */
+    build_append_gas(tbl, AML_AS_SYSTEM_MEMORY, 0 , 0, 0, 0);
+    /* X_PM2_CNT_BLK */
+    build_append_gas(tbl, AML_AS_SYSTEM_MEMORY, 0 , 0, 0, 0);
+    build_append_gas_from_struct(tbl, &f->pm_tmr); /* X_PM_TMR_BLK */
+    build_append_gas_from_struct(tbl, &f->gpe0_blk); /* X_GPE0_BLK */
+    build_append_gas(tbl, AML_AS_SYSTEM_MEMORY, 0 , 0, 0, 0); /* X_GPE1_BLK */
+
+build_hdr:
+    build_header(linker, tbl, (void *)(tbl->data + fadt_start),
+                 "FACP", tbl->len - fadt_start, f->rev, oem_id, oem_table_id);
 }
 
 void pc_madt_cpu_entry(AcpiDeviceIf *adev, int uid,
-- 
2.7.4