x86: update mptable

make mptable to be consistent with acpi routing, so we could:

1. kexec kernel with acpi=off
2. work around BIOSes where acpi routing is working, but mptable is
   not right, so can use kernel/kexec to start other OSes that don't have
   good acpi support.

command line: update_mptable

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 0 deletions

diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 2ddfabae382b..f226bdc19f69 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -1154,6 +1154,28 @@ int mp_register_gsi(u32 gsi, int triggering, int polarity)
         return gsi;
 }
 
+int mp_config_acpi_gsi(unsigned char number, unsigned int devfn, u8 pin,
+                        u32 gsi, int triggering, int polarity)
+{
+        struct mpc_config_intsrc intsrc;
+        int ioapic;
+
+        /* print the entry should happen on mptable identically */
+        intsrc.mpc_type = MP_INTSRC;
+        intsrc.mpc_irqtype = mp_INT;
+        intsrc.mpc_irqflag = (triggering == ACPI_EDGE_SENSITIVE ? 4 : 0x0c) |
+                                (polarity == ACPI_ACTIVE_HIGH ? 1 : 3);
+        intsrc.mpc_srcbus = number;
+        intsrc.mpc_srcbusirq = (((devfn >> 3) & 0x1f) << 2) | ((pin - 1) & 3);
+        ioapic = mp_find_ioapic(gsi);
+        intsrc.mpc_dstapic = mp_ioapic_routing[ioapic].apic_id;
+        intsrc.mpc_dstirq = gsi - mp_ioapic_routing[ioapic].gsi_base;
+
+        MP_intsrc_info(&intsrc);
+
+        return 0;
+}
+
 /*
  * Parse IOAPIC related entries in MADT
  * returns 0 on success, < 0 on error