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[PATCH v5 06/10] xen: generate hypercall interface related code



Instead of repeating similar data multiple times use a single source
file and a generator script for producing prototypes and call sequences
of the hypercalls.

As the script already knows the number of parameters used add generating
a macro for populating an array with the number of parameters per
hypercall.

The priorities for the specific hypercalls are based on two benchamrks
performed in guests (PV and PVH):

- make -j 4 of the Xen hypervisor (resulting in cpu load with lots of
  processes created)
- scp of a large file to the guest (network load)

With a small additional debug patch applied the number of the
different hypercalls in the guest and in dom0 (for looking at backend
activity related hypercalls) were counted while the benchmark in domU
was running:

PV-hypercall    PV-guest build   PV-guest scp    dom0 build     dom0 scp
mmu_update           186175729           2865         20936        33725
stack_switch           1273311          62381        108589       270764
multicall              2182803             50           302          524
update_va_mapping       571868             10            60           80
xen_version              73061            850           859         5432
grant_table_op               0              0         35557       139110
iret                  75673006         484132        268157       757958
vcpu_op                 453037          71199        138224       334988
set_segment_base       1650249          62387        108645       270823
mmuext_op             11225681            188          7239         3426
sched_op                280153         134645         70729       137943
event_channel_op        192327          66204         71409       214191
physdev_op                   0              0          7721         4315
(the dom0 values are for the guest running the build or scp test, so
dom0 acting as backend)

HVM-hypercall   PVH-guest build    PVH-guest scp
vcpu_op                  277684             2324
event_channel_op         350233            57383
(the related dom0 counter values are in the same range as with the test
running in the PV guest)

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
V2:
- split platform_op for doe and compat prefixes (Jan Beulich)
- add "addline:" directive
- add priorities to handlers (Jan Beulich)
V2.1:
- add missing "delete" statement in awk script
- optimize case of 2 hypercalls with same priority
V2.2:
- avoid asort() function (Michal Orzel)
V3:
- drop "addline:" support, as no longer needed
- enclose call sequence macros in "({ ... })" (Jan Beulich)
- small style adjustment (Jan Beulich)
- move generating to xen/include/Makefile (Anthony PERARD)
V4:
- generate cf_check attribute for prototype (will be removed in later patch)
- add Arm-specific variant of physdev_op()
V5:
- user $(srctree) (Anthony Perard)
- specify priority 1 for arm evtchn_op (Julien Grall)
---
 .gitignore                    |   1 +
 xen/include/Makefile          |  13 ++
 xen/include/hypercall-defs.c  | 285 ++++++++++++++++++++++++++++++
 xen/scripts/gen_hypercall.awk | 314 ++++++++++++++++++++++++++++++++++
 4 files changed, 613 insertions(+)
 create mode 100644 xen/include/hypercall-defs.c
 create mode 100644 xen/scripts/gen_hypercall.awk

diff --git a/.gitignore b/.gitignore
index d425be4bd9..c6e5b31b98 100644
--- a/.gitignore
+++ b/.gitignore
@@ -324,6 +324,7 @@ xen/include/public/public
 xen/include/xen/*.new
 xen/include/xen/acm_policy.h
 xen/include/xen/compile.h
+xen/include/xen/hypercall-defs.h
 xen/include/xen/lib/x86/cpuid-autogen.h
 xen/test/livepatch/config.h
 xen/test/livepatch/expect_config.h
diff --git a/xen/include/Makefile b/xen/include/Makefile
index a3c2511f5f..dfc43f9fba 100644
--- a/xen/include/Makefile
+++ b/xen/include/Makefile
@@ -77,6 +77,18 @@ $(obj)/compat/xlat.h: $(addprefix 
$(obj)/compat/.xlat/,$(xlat-y)) $(obj)/config/
        cat $(filter %.h,$^) >$@.new
        mv -f $@.new $@
 
+quiet_cmd_genhyp = GEN     $@
+define cmd_genhyp
+    awk -f $(srctree)/scripts/gen_hypercall.awk <$< >$@
+endef
+
+all: $(obj)/xen/hypercall-defs.h
+
+$(obj)/xen/hypercall-defs.h: $(obj)/hypercall-defs.i 
$(srctree)/scripts/gen_hypercall.awk FORCE
+       $(call if_changed,genhyp)
+
+targets += xen/hypercall-defs.h
+
 ifeq ($(XEN_TARGET_ARCH),$(XEN_COMPILE_ARCH))
 
 all: $(obj)/headers.chk $(obj)/headers99.chk $(obj)/headers++.chk
@@ -132,3 +144,4 @@ all: lib-x86-all
 endif
 
 clean-files := compat config generated headers*.chk xen/lib/x86/cpuid-autogen.h
+clean-files += xen/hypercall-defs.h hypercall-defs.i
diff --git a/xen/include/hypercall-defs.c b/xen/include/hypercall-defs.c
new file mode 100644
index 0000000000..60cbeb18e4
--- /dev/null
+++ b/xen/include/hypercall-defs.c
@@ -0,0 +1,285 @@
+/*
+ * Hypercall interface description:
+ * Used by scripts/gen_hypercall.awk to generate hypercall prototypes and call
+ * sequences.
+ *
+ * Syntax is like a prototype, but without return type and without the ";" at
+ * the end. Pointer types will be automatically converted to use the
+ * XEN_GUEST_HANDLE_PARAM() macro. Handlers with no parameters just use a
+ * definition like "fn()".
+ * Hypercall/function names are without the leading "__HYPERVISOR_"/"do_"
+ * strings.
+ *
+ * The return type of a class of prototypes using the same prefix is set via:
+ * rettype: <prefix> <type>
+ * Default return type is "long". A return type for a prefix can be set only
+ * once and it needs to be set before that prefix is being used via the
+ * "prefix:" directive.
+ *
+ * The prefix of the prototypes is set via a line:
+ * prefix: <prefix> ...
+ * Multiple prefixes are possible (restriction see below). Prefixes are without
+ * a trailing "_". The current prefix settings are active until a new "prefix:"
+ * line.
+ *
+ * Caller macros are suffixed with a selectable name via lines like:
+ * caller: <suffix>
+ * When a caller suffix is active, there is only one active prefix allowed.
+ *
+ * With a "defhandle:" line it is possible to add a DEFINE_XEN_GUEST_HANDLE()
+ * to the generated header:
+ * defhandle: <handle-type> [<type>]
+ * Without specifying <type> only a DEFINE_XEN_GUEST_HANDLE(<handle-type>)
+ * will be generated, otherwise it will be a
+ * __DEFINE_XEN_GUEST_HANDLE(<handle-type>, <type>) being generated. Note that
+ * the latter will include the related "const" handle "const_<handle-type>".
+ *
+ * In order to support using coding style compliant pointers in the
+ * prototypes it is possible to add translation entries to generate the correct
+ * handle types:
+ * handle: <handle-type> <type>
+ * This will result in the prototype translation from "<type> *" to
+ * "XEN_GUEST_HANDLE_PARAM(<handle-type>)".
+ *
+ * The hypercall handler calling code will be generated from a final table in
+ * the source file, which is started via the line:
+ * table: <caller> <caller> ...
+ * with the <caller>s specifying the designated caller macro of each column of
+ * the table. Any column of a <caller> not having been set via a "caller:"
+ * line will be ignored.
+ * The first column of the table contains the hypercall/prototype, each
+ * <caller> column contains the prefix for the function to use for that caller.
+ * A function prefix can be annotated with a priority by adding ":<prio>" to it
+ * ("1" being the highest priority, higher numbers mean lower priority, no
+ * priority specified is the lowest priority). The generated code will try to
+ * achieve better performance for calling high priority handlers.
+ * A column not being supported by a <caller> is marked with "-". Lines with 
all
+ * entries being "-" after removal of inactive <caller> columns are ignored.
+ *
+ * This file is being preprocessed using $(CPP), so #ifdef CONFIG_* 
conditionals
+ * are possible.
+ */
+
+#ifdef CONFIG_HVM
+#define PREFIX_hvm hvm
+#else
+#define PREFIX_hvm
+#endif
+
+#ifdef CONFIG_COMPAT
+#define PREFIX_compat compat
+rettype: compat int
+#else
+#define PREFIX_compat
+#endif
+
+#ifdef CONFIG_ARM
+#define PREFIX_dep dep
+#define PREFIX_do_arm do_arm
+rettype: do_arm int
+#else
+#define PREFIX_dep
+#define PREFIX_do_arm
+#endif
+
+handle: uint unsigned int
+handle: const_void const void
+handle: const_char const char
+
+#ifdef CONFIG_COMPAT
+defhandle: multicall_entry_compat_t
+#ifndef CONFIG_PV_SHIM_EXCLUSIVE
+defhandle: compat_platform_op_t
+#endif
+#endif
+#ifdef CONFIG_PV32
+defhandle: trap_info_compat_t
+defhandle: physdev_op_compat_t
+#endif
+
+prefix: do PREFIX_hvm PREFIX_compat PREFIX_do_arm
+physdev_op(int cmd, void *arg)
+
+prefix: do PREFIX_hvm PREFIX_compat
+#if defined(CONFIG_GRANT_TABLE) || defined(CONFIG_PV_SHIM)
+grant_table_op(unsigned int cmd, void *uop, unsigned int count)
+#endif
+
+prefix: do PREFIX_hvm
+memory_op(unsigned long cmd, void *arg)
+
+prefix: do PREFIX_compat
+xen_version(int cmd, void *arg)
+vcpu_op(int cmd, unsigned int vcpuid, void *arg)
+sched_op(int cmd, void *arg)
+xsm_op(void *op)
+callback_op(int cmd, const void *arg)
+#ifdef CONFIG_ARGO
+argo_op(unsigned int cmd, void *arg1, void *arg2, unsigned long arg3, unsigned 
long arg4)
+#endif
+#ifdef CONFIG_KEXEC
+kexec_op(unsigned int op, void *uarg)
+#endif
+#ifdef CONFIG_PV
+iret()
+nmi_op(unsigned int cmd, void *arg)
+#ifdef CONFIG_XENOPROF
+xenoprof_op(int op, void *arg)
+#endif
+#endif /* CONFIG_PV */
+
+#ifdef CONFIG_COMPAT
+prefix: compat
+set_timer_op(uint32_t lo, int32_t hi)
+multicall(multicall_entry_compat_t *call_list, uint32_t nr_calls)
+memory_op(unsigned int cmd, void *arg)
+#ifdef CONFIG_IOREQ_SERVER
+dm_op(domid_t domid, unsigned int nr_bufs, void *bufs)
+#endif
+mmuext_op(void *arg, unsigned int count, uint *pdone, unsigned int foreigndom)
+#ifdef CONFIG_PV32
+set_trap_table(trap_info_compat_t *traps)
+set_gdt(unsigned int *frame_list, unsigned int entries)
+set_callbacks(unsigned long event_selector, unsigned long event_address, 
unsigned long failsafe_selector, unsigned long failsafe_address)
+update_descriptor(uint32_t pa_lo, uint32_t pa_hi, uint32_t desc_lo, uint32_t 
desc_hi)
+update_va_mapping(unsigned int va, uint32_t lo, uint32_t hi, unsigned int 
flags)
+physdev_op_compat(physdev_op_compat_t *uop)
+update_va_mapping_otherdomain(unsigned int va, uint32_t lo, uint32_t hi, 
unsigned int flags, domid_t domid)
+#endif
+#ifndef CONFIG_PV_SHIM_EXCLUSIVE
+platform_op(compat_platform_op_t *u_xenpf_op)
+#endif
+#endif /* CONFIG_COMPAT */
+
+#if defined(CONFIG_PV) || defined(CONFIG_ARM)
+prefix: do PREFIX_dep
+event_channel_op_compat(evtchn_op_t *uop)
+physdev_op_compat(physdev_op_t *uop)
+/* Legacy hypercall (as of 0x00030101). */
+sched_op_compat(int cmd, unsigned long arg)
+#endif
+
+prefix: do
+set_timer_op(s_time_t timeout)
+console_io(unsigned int cmd, unsigned int count, char *buffer)
+vm_assist(unsigned int cmd, unsigned int type)
+event_channel_op(int cmd, void *arg)
+mmuext_op(mmuext_op_t *uops, unsigned int count, unsigned int *pdone, unsigned 
int foreigndom)
+multicall(multicall_entry_t *call_list, unsigned int nr_calls)
+#ifdef CONFIG_PV
+mmu_update(mmu_update_t *ureqs, unsigned int count, unsigned int *pdone, 
unsigned int foreigndom)
+stack_switch(unsigned long ss, unsigned long esp)
+fpu_taskswitch(int set)
+set_debugreg(int reg, unsigned long value)
+get_debugreg(int reg)
+set_segment_base(unsigned int which, unsigned long base)
+mca(xen_mc_t *u_xen_mc)
+set_trap_table(const_trap_info_t *traps)
+set_gdt(xen_ulong_t *frame_list, unsigned int entries)
+set_callbacks(unsigned long event_address, unsigned long failsafe_address, 
unsigned long syscall_address)
+update_descriptor(uint64_t gaddr, seg_desc_t desc)
+update_va_mapping(unsigned long va, uint64_t val64, unsigned long flags)
+update_va_mapping_otherdomain(unsigned long va, uint64_t val64, unsigned long 
flags, domid_t domid)
+#endif
+#ifdef CONFIG_IOREQ_SERVER
+dm_op(domid_t domid, unsigned int nr_bufs, xen_dm_op_buf_t *bufs)
+#endif
+#ifndef CONFIG_PV_SHIM_EXCLUSIVE
+sysctl(xen_sysctl_t *u_sysctl)
+domctl(xen_domctl_t *u_domctl)
+paging_domctl_cont(xen_domctl_t *u_domctl)
+platform_op(xen_platform_op_t *u_xenpf_op)
+#endif
+#ifdef CONFIG_HVM
+hvm_op(unsigned long op, void *arg)
+#endif
+#ifdef CONFIG_HYPFS
+hypfs_op(unsigned int cmd, const char *arg1, unsigned long arg2, void *arg3, 
unsigned long arg4)
+#endif
+#ifdef CONFIG_X86
+xenpmu_op(unsigned int op, xen_pmu_params_t *arg)
+#endif
+
+#ifdef CONFIG_PV
+caller: pv64
+#ifdef CONFIG_PV32
+caller: pv32
+#endif
+#endif
+#if defined(CONFIG_HVM) && defined(CONFIG_X86)
+caller: hvm64
+#ifdef CONFIG_COMPAT
+caller: hvm32
+#endif
+#endif
+#ifdef CONFIG_ARM
+caller: arm
+#endif
+
+table:                             pv32     pv64     hvm32    hvm64    arm
+set_trap_table                     compat   do       -        -        -
+mmu_update                         do:1     do:1     -        -        -
+set_gdt                            compat   do       -        -        -
+stack_switch                       do:2     do:2     -        -        -
+set_callbacks                      compat   do       -        -        -
+fpu_taskswitch                     do       do       -        -        -
+sched_op_compat                    do       do       -        -        dep
+#ifndef CONFIG_PV_SHIM_EXCLUSIVE
+platform_op                        compat   do       compat   do       do
+#endif
+set_debugreg                       do       do       -        -        -
+get_debugreg                       do       do       -        -        -
+update_descriptor                  compat   do       -        -        -
+memory_op                          compat   do       hvm      hvm      do
+multicall                          compat:2 do:2     compat   do       do
+update_va_mapping                  compat   do       -        -        -
+set_timer_op                       compat   do       compat   do       -
+event_channel_op_compat            do       do       -        -        dep
+xen_version                        compat   do       compat   do       do
+console_io                         do       do       do       do       do
+physdev_op_compat                  compat   do       -        -        dep
+#if defined(CONFIG_GRANT_TABLE) || defined(CONFIG_PV_SHIM)
+grant_table_op                     compat   do       hvm      hvm      do
+#endif
+vm_assist                          do       do       do       do       do
+update_va_mapping_otherdomain      compat   do       -        -        -
+iret                               compat:1 do:1     -        -        -
+vcpu_op                            compat   do       compat:1 do:1     do
+set_segment_base                   do:2     do:2     -        -        -
+#ifdef CONFIG_PV
+mmuext_op                          compat:2 do:2     compat   do       -
+#endif
+xsm_op                             compat   do       compat   do       do
+nmi_op                             compat   do       -        -        -
+sched_op                           compat   do       compat   do       do
+callback_op                        compat   do       -        -        -
+#ifdef CONFIG_XENOPROF
+xenoprof_op                        compat   do       -        -        -
+#endif
+event_channel_op                   do       do       do:1     do:1     do:1
+physdev_op                         compat   do       hvm      hvm      do_arm
+#ifdef CONFIG_HVM
+hvm_op                             do       do       do       do       do
+#endif
+#ifndef CONFIG_PV_SHIM_EXCLUSIVE
+sysctl                             do       do       do       do       do
+domctl                             do       do       do       do       do
+#endif
+#ifdef CONFIG_KEXEC
+kexec_op                           compat   do       -        -        -
+#endif
+tmem_op                            -        -        -        -        -
+#ifdef CONFIG_ARGO
+argo_op                            compat   do       compat   do       do
+#endif
+xenpmu_op                          do       do       do       do       -
+#ifdef CONFIG_IOREQ_SERVER
+dm_op                              compat   do       compat   do       do
+#endif
+#ifdef CONFIG_HYPFS
+hypfs_op                           do       do       do       do       do
+#endif
+mca                                do       do       -        -        -
+#ifndef CONFIG_PV_SHIM_EXCLUSIVE
+paging_domctl_cont                 do       do       do       do       -
+#endif
diff --git a/xen/scripts/gen_hypercall.awk b/xen/scripts/gen_hypercall.awk
new file mode 100644
index 0000000000..403758be21
--- /dev/null
+++ b/xen/scripts/gen_hypercall.awk
@@ -0,0 +1,314 @@
+# awk script to generate hypercall handler prototypes and a macro for doing
+# the calls of the handlers inside a switch() statement.
+
+BEGIN {
+    printf("/* Generated file, do not edit! */\n\n");
+    e = 0;
+    n = 0;
+    p = 0;
+    nc = 0;
+}
+
+# Issue error to stderr
+function do_err(msg) {
+    print "Error: "msg": "$0 >"/dev/stderr";
+    exit 1;
+}
+
+# Generate handler call
+function do_call(f, p,    i) {
+    printf("            ret = %s_%s(", pre[f, p], fn[f]);
+    for (i = 1; i <= n_args[f]; i++) {
+        if (i > 1)
+            printf(", ");
+        if (ptr[f, i])
+            printf("(XEN_GUEST_HANDLE_PARAM(%s)){ _p(a%d) }", typ[f, i], i);
+        else
+            printf("(%s)(a%d)", typ[f, i], i);
+    }
+    printf("); \\\n");
+}
+
+# Generate case statement for call
+function do_case(f, p) {
+    printf("        case __HYPERVISOR_%s: \\\n", fn[f]);
+    do_call(f, p);
+    printf("            break; \\\n");
+}
+
+# Generate switch statement for calling handlers
+function do_switch(ca, p,    i) {
+    printf("        switch ( num ) \\\n");
+    printf("        { \\\n");
+    for (i = 1; i <= nc; i++)
+        if (call[i] == ca && call_prio[i] == p)
+            do_case(call_fn[i], call_p[i]);
+    printf("        default: \\\n");
+    printf("            ret = -ENOSYS; \\\n");
+    printf("            break; \\\n");
+    printf("        } \\\n");
+}
+
+function rest_of_line(par,    i, val) {
+    val = $(par);
+    for (i = par + 1; i <= NF; i++)
+        val = val " " $(i);
+    return val;
+}
+
+# Handle comments (multi- and single line)
+$1 == "/*" {
+    comment = 1;
+}
+comment == 1 {
+    if ($(NF) == "*/") comment = 0;
+    next;
+}
+
+# Skip preprocessing artefacts
+$1 == "extern" {
+    next;
+}
+/^#/ {
+    next;
+}
+
+# Drop empty lines
+NF == 0 {
+    next;
+}
+
+# Handle "handle:" line
+$1 == "handle:" {
+    if (NF < 3)
+        do_err("\"handle:\" requires at least two parameters");
+    val = rest_of_line(3);
+    xlate[val] = $2;
+    next;
+}
+
+# Handle "defhandle:" line
+$1 == "defhandle:" {
+    if (NF < 2)
+        do_err("\"defhandle:\" requires at least one parameter");
+    e++;
+    if (NF == 2) {
+        emit[e] = sprintf("DEFINE_XEN_GUEST_HANDLE(%s);", $2);
+    } else {
+        val = rest_of_line(3);
+        emit[e] = sprintf("__DEFINE_XEN_GUEST_HANDLE(%s, %s);", $2, val);
+        xlate[val] = $2;
+    }
+    next;
+}
+
+# Handle "rettype:" line
+$1 == "rettype:" {
+    if (NF < 3)
+        do_err("\"rettype:\" requires at least two parameters");
+    if ($2 in rettype)
+        do_err("rettype can be set only once for each prefix");
+    rettype[$2] = rest_of_line(3);
+    next;
+}
+
+# Handle "caller:" line
+$1 == "caller:" {
+    caller[$2] = 1;
+    next;
+}
+
+# Handle "prefix:" line
+$1 == "prefix:" {
+    p = NF - 1;
+    for (i = 2; i <= NF; i++) {
+        prefix[i - 1] = $(i);
+        if (!(prefix[i - 1] in rettype))
+            rettype[prefix[i - 1]] = "long";
+    }
+    next;
+}
+
+# Handle "table:" line
+$1 == "table:" {
+    table = 1;
+    for (i = 2; i <= NF; i++)
+        col[i - 1] = $(i);
+    n_cols = NF - 1;
+    next;
+}
+
+# Handle table definition line
+table == 1 {
+    if (NF != n_cols + 1)
+        do_err("Table definition line has wrong number of fields");
+    for (c = 1; c <= n_cols; c++) {
+        if (caller[col[c]] != 1)
+            continue;
+        if ($(c + 1) == "-")
+            continue;
+        pref = $(c + 1);
+        idx = index(pref, ":");
+        if (idx == 0)
+            prio = 100;
+        else {
+            prio = substr(pref, idx + 1) + 0;
+            pref = substr(pref, 1, idx - 1);
+            if (prio >= 100 || prio < 1)
+                do_err("Priority must be in the range 1..99");
+        }
+        fnd = 0;
+        for (i = 1; i <= n; i++) {
+            if (fn[i] != $1)
+                continue;
+            for (j = 1; j <= n_pre[i]; j++) {
+                if (pre[i, j] == pref) {
+                    prios[col[c], prio]++;
+                    if (prios[col[c], prio] == 1) {
+                        n_prios[col[c]]++;
+                        prio_list[col[c], n_prios[col[c]]] = prio;
+                        prio_mask[col[c], prio] = "(1ULL << 
__HYPERVISOR_"$1")";
+                    } else
+                        prio_mask[col[c], prio] = prio_mask[col[c], prio] " | 
(1ULL << __HYPERVISOR_"$1")";
+                    nc++;
+                    call[nc] = col[c];
+                    call_fn[nc] = i;
+                    call_p[nc] = j;
+                    call_prio[nc] = prio;
+                    fnd = 1;
+                }
+            }
+        }
+        if (fnd == 0)
+            do_err("No prototype for prefix/hypercall combination");
+    }
+    next;
+}
+
+# Prototype line
+{
+    bro = index($0, "(");
+    brc = index($0, ")");
+    if (bro < 2 || brc < bro)
+        do_err("No valid prototype line");
+    n++;
+    fn[n] = substr($0, 1, bro - 1);
+    n_pre[n] = p;
+    for (i = 1; i <= p; i++)
+        pre[n, i] = prefix[i];
+    args = substr($0, bro + 1, brc - bro - 1);
+    n_args[n] = split(args, a, ",");
+    if (n_args[n] > 5)
+        do_err("Too many parameters");
+    for (i = 1; i <= n_args[n]; i++) {
+        sub("^ *", "", a[i]);         # Remove leading white space
+        sub(" +", " ", a[i]);         # Replace multiple spaces with single 
ones
+        sub(" *$", "", a[i]);         # Remove trailing white space
+        ptr[n, i] = index(a[i], "*"); # Is it a pointer type?
+        sub("[*]", "", a[i]);         # Remove "*"
+        if (index(a[i], " ") == 0)
+            do_err("Parameter with no type or no name");
+        typ[n, i] = a[i];
+        sub(" [^ ]+$", "", typ[n, i]);    # Remove parameter name
+        if (ptr[n, i] && (typ[n, i] in xlate))
+            typ[n, i] = xlate[typ[n, i]];
+        arg[n, i] = a[i];
+        sub("^([^ ]+ )+", "", arg[n, i]); # Remove parameter type
+    }
+}
+
+# Generate the output
+END {
+    # Verbatim generated lines
+    for (i = 1; i <= e; i++)
+        printf("%s\n", emit[i]);
+    printf("\n");
+    # Generate prototypes
+    for (i = 1; i <= n; i++) {
+        for (p = 1; p <= n_pre[i]; p++) {
+            printf("%s cf_check %s_%s(", rettype[pre[i, p]], pre[i, p], fn[i]);
+            if (n_args[i] == 0)
+                printf("void");
+            else
+                for (j = 1; j <= n_args[i]; j++) {
+                    if (j > 1)
+                        printf(", ");
+                    if (ptr[i, j])
+                        printf("XEN_GUEST_HANDLE_PARAM(%s)", typ[i, j]);
+                    else
+                        printf("%s", typ[i, j]);
+                    printf(" %s", arg[i, j]);
+                }
+            printf(");\n");
+        }
+    }
+    # Generate call sequences and args array contents
+    for (ca in caller) {
+        if (caller[ca] != 1)
+            continue;
+        need_mask = 0;
+        for (pl = 1; pl <= n_prios[ca]; pl++) {
+            for (pll = pl; pll > 1; pll--) {
+                if (prio_list[ca, pl] > p_list[pll - 1])
+                    break;
+                else
+                    p_list[pll] = p_list[pll - 1];
+            }
+            p_list[pll] = prio_list[ca, pl];
+            # If any prio but the default one has more than 1 entry we need 
"mask"
+            if (p_list[pll] != 100 && prios[ca, p_list[pll]] > 1)
+                need_mask = 1;
+        }
+        printf("\n");
+        printf("#define call_handlers_%s(num, ret, a1, a2, a3, a4, a5) \\\n", 
ca);
+        printf("({ \\\n");
+        if (need_mask)
+            printf("    uint64_t mask = 1ULL << num; \\\n");
+        printf("    ");
+        for (pl = 1; pl <= n_prios[ca]; pl++) {
+            if (prios[ca, p_list[pl]] > 1) {
+                if (pl < n_prios[ca]) {
+                    printf("    if ( likely(mask & (%s)) ) \\\n", 
prio_mask[ca, p_list[pl]]);
+                    printf("    { \\\n");
+                }
+                if (prios[ca, p_list[pl]] == 2) {
+                    fnd = 0;
+                    for (i = 1; i <= nc; i++)
+                        if (call[i] == ca && call_prio[i] == p_list[pl]) {
+                            fnd++;
+                            if (fnd == 1)
+                                printf("        if ( num == __HYPERVISOR_%s ) 
\\\n", fn[call_fn[i]]);
+                            else
+                                printf("        else \\\n");
+                            do_call(call_fn[i], call_p[i]);
+                        }
+                } else {
+                    do_switch(ca, p_list[pl]);
+                }
+                if (pl < n_prios[ca])
+                    printf("    } \\\n");
+            } else {
+                for (i = 1; i <= nc; i++)
+                    if (call[i] == ca && call_prio[i] == p_list[pl]) {
+                        printf("if ( likely(num == __HYPERVISOR_%s) ) \\\n", 
fn[call_fn[i]]);
+                        do_call(call_fn[i], call_p[i]);
+                    }
+            }
+            if (pl < n_prios[ca] || prios[ca, p_list[pl]] <= 2)
+                printf("    else \\\n");
+        }
+        if (prios[ca, p_list[n_prios[ca]]] <= 2) {
+            printf("\\\n");
+            printf("        ret = -ENOSYS; \\\n");
+        }
+        printf("})\n");
+        delete p_list;
+        printf("\n");
+        printf("#define hypercall_args_%s \\\n", ca);
+        printf("{ \\\n");
+        for (i = 1; i <= nc; i++)
+            if (call[i] == ca)
+                printf("[__HYPERVISOR_%s] = %d, \\\n", fn[call_fn[i]], 
n_args[call_fn[i]]);
+        printf("}\n");
+    }
+}
-- 
2.34.1




 


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