1 files changed, 158 insertions, 0 deletions
diff --git a/qemu/roms/seabios/src/resume.c b/qemu/roms/seabios/src/resume.c
new file mode 100644
index 000000000..19031747c
--- /dev/null
+++ b/qemu/roms/seabios/src/resume.c
@@ -0,0 +1,158 @@
+// Code for handling calls to "post" that are resume related.
+//
+// Copyright (C) 2008,2009  Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU LGPLv3 license.
+
+#include "bregs.h" // struct bregs
+#include "config.h" // CONFIG_*
+#include "farptr.h" // FLATPTR_TO_SEGOFF
+#include "hw/pci.h" // pci_reboot
+#include "hw/pic.h" // pic_eoi2
+#include "hw/ps2port.h" // i8042_reboot
+#include "hw/rtc.h" // rtc_read
+#include "output.h" // dprintf
+#include "stacks.h" // farcall16big
+#include "std/bda.h" // struct bios_data_area_s
+#include "string.h" // memset
+#include "util.h" // dma_setup
+
+// Handler for post calls that look like a resume.
+void VISIBLE16
+handle_resume(void)
+{
+    ASSERT16();
+    int status = rtc_read(CMOS_RESET_CODE);
+    rtc_write(CMOS_RESET_CODE, 0);
+    dprintf(1, "In resume (status=%d)\n", status);
+
+    dma_setup();
+
+    switch (status) {
+    case 0x01 ... 0x04:
+    case 0x06 ... 0x09:
+        panic("Unimplemented shutdown status: %02x\n", status);
+
+    case 0x05:
+        // flush keyboard (issue EOI) and jump via 40h:0067h
+        pic_eoi2();
+        // NO BREAK
+    case 0x0a:
+#define BDA_JUMP (((struct bios_data_area_s *)0)->jump)
+        // resume execution by jump via 40h:0067h
+        asm volatile(
+            "movw %w1, %%ds\n"
+            "ljmpw *%0\n"
+            : : "m"(BDA_JUMP), "r"(SEG_BDA)
+            );
+        break;
+
+    case 0x0b:
+        // resume execution via IRET via 40h:0067h
+        asm volatile(
+            "movw %w1, %%ds\n"
+            "lssw %0, %%sp\n"
+            "iretw\n"
+            : : "m"(BDA_JUMP), "r"(SEG_BDA)
+            );
+        break;
+
+    case 0x0c:
+        // resume execution via RETF via 40h:0067h
+        asm volatile(
+            "movw %w1, %%ds\n"
+            "lssw %0, %%sp\n"
+            "lretw\n"
+            : : "m"(BDA_JUMP), "r"(SEG_BDA)
+            );
+        break;
+
+    default:
+        break;
+    }
+
+    // Not a 16bit resume - do remaining checks in 32bit mode
+    asm volatile(
+        "movw %w1, %%ss\n"
+        "movl %0, %%esp\n"
+        "movl $_cfunc32flat_handle_resume32, %%edx\n"
+        "jmp transition32\n"
+        : : "i"(BUILD_S3RESUME_STACK_ADDR), "r"(0), "a"(status)
+        );
+}
+
+// Handle an S3 resume event
+static void
+s3_resume(void)
+{
+    if (!CONFIG_S3_RESUME)
+        return;
+
+    u32 s3_resume_vector = find_resume_vector();
+    if (!s3_resume_vector) {
+        dprintf(1, "No resume vector set!\n");
+        return;
+    }
+
+    pic_setup();
+    smm_setup();
+
+    pci_resume();
+
+    s3_resume_vga();
+
+    make_bios_readonly();
+
+    // Invoke the resume vector.
+    struct bregs br;
+    memset(&br, 0, sizeof(br));
+    dprintf(1, "Jump to resume vector (%x)\n", s3_resume_vector);
+    br.code = FLATPTR_TO_SEGOFF((void*)s3_resume_vector);
+    farcall16big(&br);
+}
+
+u8 HaveAttemptedReboot VARLOW;
+
+// Attempt to invoke a hard-reboot.
+static void
+tryReboot(void)
+{
+    if (HaveAttemptedReboot) {
+        // Hard reboot has failed - try to shutdown machine.
+        dprintf(1, "Unable to hard-reboot machine - attempting shutdown.\n");
+        apm_shutdown();
+    }
+    HaveAttemptedReboot = 1;
+
+    dprintf(1, "Attempting a hard reboot\n");
+
+    // Setup for reset on qemu.
+    qemu_prep_reset();
+
+    // Reboot using ACPI RESET_REG
+    acpi_reboot();
+
+    // Try keyboard controller reboot.
+    i8042_reboot();
+
+    // Try PCI 0xcf9 reboot
+    pci_reboot();
+
+    // Try triple fault
+    asm volatile("int3");
+
+    panic("Could not reboot");
+}
+
+void VISIBLE32FLAT
+handle_resume32(int status)
+{
+    ASSERT32FLAT();
+    dprintf(1, "In 32bit resume\n");
+
+    if (status == 0xfe)
+        s3_resume();
+
+    // Must be a soft reboot - invoke a hard reboot.
+    tryReboot();
+}