ia64/xen: define helper functions for xen hypercalls.

introduce helper functions for xen hypercalls which
traps to hypervisor.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Tony Luck <tony.luck@intel.com>

2 files changed, 96 insertions, 0 deletions

diff --git a/arch/ia64/xen/Makefile b/arch/ia64/xen/Makefile
new file mode 100644
index 000000000000..c200704e2333
--- /dev/null
+++ b/arch/ia64/xen/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for Xen components
+#
+
+obj-y := hypercall.o
diff --git a/arch/ia64/xen/hypercall.S b/arch/ia64/xen/hypercall.S
new file mode 100644
index 000000000000..d4ff0b9e79f1
--- /dev/null
+++ b/arch/ia64/xen/hypercall.S
@@ -0,0 +1,91 @@
+/*
+ * Support routines for Xen hypercalls
+ *
+ * Copyright (C) 2005 Dan Magenheimer <dan.magenheimer@hp.com>
+ * Copyright (C) 2008 Yaozu (Eddie) Dong <eddie.dong@intel.com>
+ */
+
+#include <asm/asmmacro.h>
+#include <asm/intrinsics.h>
+#include <asm/xen/privop.h>
+
+/*
+ * Hypercalls without parameter.
+ */
+#define __HCALL0(name,hcall)            \
+        GLOBAL_ENTRY(name);             \
+        break   hcall;                  \
+        br.ret.sptk.many rp;            \
+        END(name)
+
+/*
+ * Hypercalls with 1 parameter.
+ */
+#define __HCALL1(name,hcall)            \
+        GLOBAL_ENTRY(name);             \
+        mov r8=r32;                     \
+        break   hcall;                  \
+        br.ret.sptk.many rp;            \
+        END(name)
+
+/*
+ * Hypercalls with 2 parameters.
+ */
+#define __HCALL2(name,hcall)            \
+        GLOBAL_ENTRY(name);             \
+        mov r8=r32;                     \
+        mov r9=r33;                     \
+        break   hcall;                  \
+        br.ret.sptk.many rp;            \
+        END(name)
+
+__HCALL0(xen_get_psr, HYPERPRIVOP_GET_PSR)
+__HCALL0(xen_get_ivr, HYPERPRIVOP_GET_IVR)
+__HCALL0(xen_get_tpr, HYPERPRIVOP_GET_TPR)
+__HCALL0(xen_hyper_ssm_i, HYPERPRIVOP_SSM_I)
+
+__HCALL1(xen_set_tpr, HYPERPRIVOP_SET_TPR)
+__HCALL1(xen_eoi, HYPERPRIVOP_EOI)
+__HCALL1(xen_thash, HYPERPRIVOP_THASH)
+__HCALL1(xen_set_itm, HYPERPRIVOP_SET_ITM)
+__HCALL1(xen_get_rr, HYPERPRIVOP_GET_RR)
+__HCALL1(xen_fc, HYPERPRIVOP_FC)
+__HCALL1(xen_get_cpuid, HYPERPRIVOP_GET_CPUID)
+__HCALL1(xen_get_pmd, HYPERPRIVOP_GET_PMD)
+
+__HCALL2(xen_ptcga, HYPERPRIVOP_PTC_GA)
+__HCALL2(xen_set_rr, HYPERPRIVOP_SET_RR)
+__HCALL2(xen_set_kr, HYPERPRIVOP_SET_KR)
+
+#ifdef CONFIG_IA32_SUPPORT
+__HCALL1(xen_get_eflag, HYPERPRIVOP_GET_EFLAG)
+__HCALL1(xen_set_eflag, HYPERPRIVOP_SET_EFLAG)  // refer SDM vol1 3.1.8
+#endif /* CONFIG_IA32_SUPPORT */
+
+GLOBAL_ENTRY(xen_set_rr0_to_rr4)
+        mov r8=r32
+        mov r9=r33
+        mov r10=r34
+        mov r11=r35
+        mov r14=r36
+        XEN_HYPER_SET_RR0_TO_RR4
+        br.ret.sptk.many rp
+        ;;
+END(xen_set_rr0_to_rr4)
+
+GLOBAL_ENTRY(xen_send_ipi)
+        mov r14=r32
+        mov r15=r33
+        mov r2=0x400
+        break 0x1000
+        ;;
+        br.ret.sptk.many rp
+        ;;
+END(xen_send_ipi)
+
+GLOBAL_ENTRY(__hypercall)
+        mov r2=r37
+        break 0x1000
+        br.ret.sptk.many b0
+        ;;
+END(__hypercall)