[Xen-changelog] [xen-unstable] hvmloader: Allocate an 8 byte buffer to contain the VM generation id

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Paul Durrant <paul.durrant@xxxxxxxxxx>
# Date 1322664816 28800
# Node ID 54a9e172a373055f8c55a0f30979cd2208e618b4
# Parent  e925e47198442ef6ffcada73a6417928ca6fb6b4
hvmloader: Allocate an 8 byte buffer to contain the VM generation id
and populate it at boot time with a value read from
"platform/generation_id". Also add code to libxl to populate this
xenstore key with the value of a new 'generation_id' parameter in the
VM config file.  Populate the ADDR package of VM_Gen_Counter ACPI
device such that the first integer evaluates to the low order 32 bits
of the buffer address and the second integer evaluates to the high
order 32 bits of the buffer address.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Committed-by: Keir Fraser <keir@xxxxxxx>
---


diff -r e925e4719844 -r 54a9e172a373 tools/firmware/hvmloader/acpi/build.c
--- a/tools/firmware/hvmloader/acpi/build.c     Wed Nov 30 06:50:45 2011 -0800
+++ b/tools/firmware/hvmloader/acpi/build.c     Wed Nov 30 06:53:36 2011 -0800
@@ -297,6 +297,20 @@
     return nr_tables;
 }
 
+unsigned long new_vm_gid(void)
+{
+    uint64_t gid;
+    unsigned char *buf;
+
+    buf = mem_alloc(8, 8);
+    if (!buf) return 0;
+
+    gid = strtoll(xenstore_read("platform/generation-id", "0"), NULL, 0);
+    *(uint64_t *)buf = gid;
+
+    return virt_to_phys(buf);    
+}
+
 void acpi_build_tables(struct acpi_config *config, unsigned int physical)
 {
     struct acpi_info *acpi_info;
@@ -309,6 +323,7 @@
     unsigned char       *dsdt;
     unsigned long        secondary_tables[16];
     int                  nr_secondaries, i;
+    unsigned long        vm_gid_addr;
 
     /* Allocate and initialise the acpi info area. */
     mem_hole_populate_ram(ACPI_INFO_PHYSICAL_ADDRESS >> PAGE_SHIFT, 1);
@@ -421,12 +436,16 @@
                  offsetof(struct acpi_20_rsdp, extended_checksum),
                  sizeof(struct acpi_20_rsdp));
 
+    vm_gid_addr = new_vm_gid();
+    if (!vm_gid_addr) goto oom;
+
     acpi_info->com1_present = uart_exists(0x3f8);
     acpi_info->com2_present = uart_exists(0x2f8);
     acpi_info->lpt1_present = lpt_exists(0x378);
     acpi_info->hpet_present = hpet_exists(ACPI_HPET_ADDRESS);
     acpi_info->pci_min = pci_mem_start;
     acpi_info->pci_len = pci_mem_end - pci_mem_start;
+    acpi_info->vm_gid_addr = vm_gid_addr;
 
     return;
 
diff -r e925e4719844 -r 54a9e172a373 tools/firmware/hvmloader/util.c
--- a/tools/firmware/hvmloader/util.c   Wed Nov 30 06:50:45 2011 -0800
+++ b/tools/firmware/hvmloader/util.c   Wed Nov 30 06:53:36 2011 -0800
@@ -205,6 +205,78 @@
     return i;
 }
 
+static inline int __digit(char c, int base)
+{
+    int d = -1;
+
+    if ( (c >= '0') && (c <= '9') )
+        d = c - '0';
+
+    if ( (c >= 'A') && (c <= 'Z') )
+        d = c - 'A' + 10;
+
+    if ( (c >= 'a') && (c <= 'z') )
+        d = c - 'a' + 10;
+
+    if (d >= base)
+        d = -1;
+
+    return d;
+}
+
+long long
+strtoll(const char *s, char **end, int base)
+{
+    long long v = 0;
+    int sign = 1;
+
+    while ( (*s != '\0') && isspace(*s) )
+        s++;
+
+    if ( *s == '\0' ) goto out;
+
+    if ( *s == '-' ) {
+        sign = -1;
+        s++;
+    } else {
+        if ( *s == '+' )
+            s++;
+    }
+
+    if ( *s == '\0' ) goto out;
+
+    if ( *s == '0' ) {
+        s++;
+        if ( *s == '\0' ) goto out;
+
+        if ( *s == 'x' ) {
+            if ( base != 0 && base != 16) goto out;
+            base = 16;
+            s++;
+        } else {
+            if ( base != 0 && base != 8) goto out;
+            base = 8;
+        }
+    } else {
+        if (base != 0 && base != 10) goto out;
+        base = 10;
+    }
+
+    while ( *s != '\0' ) {
+        int d = __digit(*s, base);
+
+        if ( d < 0 ) goto out;
+
+        v = (v * base) + d;
+        s++;
+    }
+
+out:
+    if (end) *end = (char *)s;
+
+    return sign * v;
+}
+
 void *
 memset(void *s, int c, unsigned n)
 {
diff -r e925e4719844 -r 54a9e172a373 tools/firmware/hvmloader/util.h
--- a/tools/firmware/hvmloader/util.h   Wed Nov 30 06:50:45 2011 -0800
+++ b/tools/firmware/hvmloader/util.h   Wed Nov 30 06:53:36 2011 -0800
@@ -152,6 +152,7 @@
 char *strcpy(char *dest, const char *src);
 char *strncpy(char *dest, const char *src, unsigned n);
 unsigned strlen(const char *s);
+long long strtoll(const char *s, char **end, int base);
 int memcmp(const void *s1, const void *s2, unsigned n);
 void *memcpy(void *dest, const void *src, unsigned n);
 void *memmove(void *dest, const void *src, unsigned n);

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