[PATCH 09/13] xen/arm: vtimer: Move emulate_sysreg* callback in a separate header

[Julien Grall <julien.grall@arm.com>]

The core emulation of sysreg (reading/writing registers) is not specific
to the virtual timer. Move the helpers in a new header vreg.h.

Signed-off-by: Julien Grall <julien.grall@arm.com>

---

The helpers will be necessary in a follow-up patch to emulate sysreg
for another components.
---
 xen/arch/arm/vtimer.c      | 53 ++++---------------------------------------
 xen/include/asm-arm/vreg.h | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 49 deletions(-)
 create mode 100644 xen/include/asm-arm/vreg.h

diff --git a/xen/arch/arm/vtimer.c b/xen/arch/arm/vtimer.c
index 3fc97b3..091b5e7 100644
--- a/xen/arch/arm/vtimer.c
+++ b/xen/arch/arm/vtimer.c
@@ -27,6 +27,7 @@
 #include <asm/time.h>
 #include <asm/gic.h>
 #include <asm/vgic.h>
+#include <asm/vreg.h>
 #include <asm/regs.h>
 
 /*
@@ -321,52 +322,6 @@ static bool vtimer_emulate_cp64(struct cpu_user_regs *regs, union hsr hsr)
 }
 
 #ifdef CONFIG_ARM_64
-typedef bool (*vtimer_sysreg32_fn_t)(struct cpu_user_regs *regs, uint32_t *r,
-                                     bool read);
-typedef bool (*vtimer_sysreg64_fn_t)(struct cpu_user_regs *regs, uint64_t *r,
-                                     bool read);
-
-static bool vtimer_emulate_sysreg32(struct cpu_user_regs *regs, union hsr hsr,
-                                    vtimer_sysreg32_fn_t fn)
-{
-    struct hsr_sysreg sysreg = hsr.sysreg;
-    uint32_t r = 0;
-    bool ret;
-
-    if ( !sysreg.read )
-        r = get_user_reg(regs, sysreg.reg);
-
-    ret = fn(regs, &r, sysreg.read);
-
-    if ( ret && sysreg.read )
-        set_user_reg(regs, sysreg.reg, r);
-
-    return ret;
-}
-
-static bool vtimer_emulate_sysreg64(struct cpu_user_regs *regs, union hsr hsr,
-                                    vtimer_sysreg64_fn_t fn)
-{
-    struct hsr_sysreg sysreg = hsr.sysreg;
-    /*
-     * Initialize to zero to avoid leaking data if there is an
-     * implementation error in the emulation (such as not correctly
-     * setting x).
-     */
-    uint64_t x = 0;
-    bool ret;
-
-    if ( !sysreg.read )
-        x = get_user_reg(regs, sysreg.reg);
-
-    ret = fn(regs, &x, sysreg.read);
-
-    if ( ret && sysreg.read )
-        set_user_reg(regs, sysreg.reg, x);
-
-    return ret;
-}
-
 static bool vtimer_emulate_sysreg(struct cpu_user_regs *regs, union hsr hsr)
 {
     struct hsr_sysreg sysreg = hsr.sysreg;
@@ -379,11 +334,11 @@ static bool vtimer_emulate_sysreg(struct cpu_user_regs *regs, union hsr hsr)
     switch ( hsr.bits & HSR_SYSREG_REGS_MASK )
     {
     case HSR_SYSREG_CNTP_CTL_EL0:
-        return vtimer_emulate_sysreg32(regs, hsr, vtimer_cntp_ctl);
+        return vreg_emulate_sysreg32(regs, hsr, vtimer_cntp_ctl);
     case HSR_SYSREG_CNTP_TVAL_EL0:
-        return vtimer_emulate_sysreg32(regs, hsr, vtimer_cntp_tval);
+        return vreg_emulate_sysreg32(regs, hsr, vtimer_cntp_tval);
     case HSR_SYSREG_CNTP_CVAL_EL0:
-        return vtimer_emulate_sysreg64(regs, hsr, vtimer_cntp_cval);
+        return vreg_emulate_sysreg64(regs, hsr, vtimer_cntp_cval);
 
     default:
         return false;
diff --git a/xen/include/asm-arm/vreg.h b/xen/include/asm-arm/vreg.h
new file mode 100644
index 0000000..2671f6e
--- /dev/null
+++ b/xen/include/asm-arm/vreg.h
@@ -0,0 +1,56 @@
+/*
+ * Helpers to emulate co-processor and system registers
+ */
+#ifndef __ASM_ARM_VREG__
+#define __ASM_ARM_VREG__
+
+#ifdef CONFIG_ARM_64
+typedef bool (*vreg_sysreg32_fn_t)(struct cpu_user_regs *regs, uint32_t *r,
+                                   bool read);
+typedef bool (*vreg_sysreg64_fn_t)(struct cpu_user_regs *regs, uint64_t *r,
+                                   bool read);
+
+static inline bool vreg_emulate_sysreg32(struct cpu_user_regs *regs, union hsr hsr,
+                                         vreg_sysreg32_fn_t fn)
+{
+    struct hsr_sysreg sysreg = hsr.sysreg;
+    uint32_t r = 0;
+    bool ret;
+
+    if ( !sysreg.read )
+        r = get_user_reg(regs, sysreg.reg);
+
+    ret = fn(regs, &r, sysreg.read);
+
+    if ( ret && sysreg.read )
+        set_user_reg(regs, sysreg.reg, r);
+
+    return ret;
+}
+
+static inline bool vreg_emulate_sysreg64(struct cpu_user_regs *regs, union hsr hsr,
+                                         vreg_sysreg64_fn_t fn)
+{
+    struct hsr_sysreg sysreg = hsr.sysreg;
+    /*
+     * Initialize to zero to avoid leaking data if there is an
+     * implementation error in the emulation (such as not correctly
+     * setting x).
+     */
+    uint64_t x = 0;
+    bool ret;
+
+    if ( !sysreg.read )
+        x = get_user_reg(regs, sysreg.reg);
+
+    ret = fn(regs, &x, sysreg.read);
+
+    if ( ret && sysreg.read )
+        set_user_reg(regs, sysreg.reg, x);
+
+    return ret;
+}
+
+#endif
+
+#endif /* __ASM_ARM_VREG__ */
-- 
1.9.1


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