From ac66b8a24f113fc31215869648574af9f7fee26d Mon Sep 17 00:00:00 2001
From: lzw_29107 <2910729822@qq.com>
Date: Thu, 15 Aug 2024 10:19:03 +0800
Subject: [PATCH] Add ACPI Table (EGIT)

---
 hw/arm/virt-acpi-build.c | 48 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 47 insertions(+), 1 deletion(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 344a93f693bfa..71bb66f9a4b38 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -578,6 +578,49 @@ build_srat(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
     acpi_table_end(linker, &table);
 }
 
+/* EGIT */
+static void
+build_egit(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms)
+{
+    VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(vms);
+
+    uint32_t irqflags = vmc->claim_edge_triggered_timers ?
+        1 : /* Interrupt is Edge triggered */
+        0;  /* Interrupt is Level triggered  */
+    AcpiTable table = { .sig = "EGIT", .rev = 3, .oem_id = vms->oem_id,
+                        .oem_table_id = vms->oem_table_id };
+
+    acpi_table_begin(&table, table_data);
+
+    /* CntControlBase Physical Address */
+    build_append_int_noprefix(table_data, 0xFFFFFFFFFFFFFFFF, 8);
+    /*
+     * FIXME: clarify comment:
+     * The interrupt values are the same with the device tree when adding 16
+     */
+    /* Secure EL1 timer GSIV */
+    build_append_int_noprefix(table_data, ARCH_TIMER_S_EL1_IRQ, 4);
+    /* Non-Secure EL1 timer GSIV */
+    build_append_int_noprefix(table_data, ARCH_TIMER_NS_EL1_IRQ, 4);
+    /* Virtual timer GSIV */
+    build_append_int_noprefix(table_data, ARCH_TIMER_VIRT_IRQ, 4);
+    /* Non-Secure EL2 timer GSIV */
+    build_append_int_noprefix(table_data, ARCH_TIMER_NS_EL2_IRQ, 4);
+    /* Secure EL1 timer Flags */
+    build_append_int_noprefix(table_data, irqflags, 4);
+    /* Non-Secure EL1 timer Flags */
+    build_append_int_noprefix(table_data, irqflags |
+                              1UL << 2, /* Always-on Capability */
+                              4);
+    /* Virtual Timer Flags */
+    build_append_int_noprefix(table_data, irqflags, 4);
+    /* Non-Secure EL2 timer Flags */
+    build_append_int_noprefix(table_data, irqflags, 4);
+
+    build_append_int_noprefix(table_data, 0, 4); /* Reserved */
+    acpi_table_end(linker, &table);
+}
+
 /*
  * ACPI spec, Revision 6.5
  * 5.2.25 Generic Timer Description Table (GTDT)
@@ -965,7 +1008,7 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
     dsdt = tables_blob->len;
     build_dsdt(tables_blob, tables->linker, vms);
 
-    /* FADT MADT PPTT GTDT MCFG SPCR DBG2 pointed to by RSDT */
+    /* FADT MADT PPTT EGIT GTDT MCFG SPCR DBG2 pointed to by RSDT */
     acpi_add_table(table_offsets, tables_blob);
     build_fadt_rev6(tables_blob, tables->linker, vms, dsdt);
 
@@ -978,6 +1021,9 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
                    vms->oem_id, vms->oem_table_id);
     }
 
+    acpi_add_table(table_offsets, tables_blob);
+    build_egit(tables_blob, tables->linker, vms);
+
     acpi_add_table(table_offsets, tables_blob);
     build_gtdt(tables_blob, tables->linker, vms);