qtest: add m48t59 tests for Sparc

Add simple m48t59 qtests, enable test only for Sparc32
and Sparc64. On PPC, the device is behind PCI bus.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

tests/Makefile

@@ -20,6 +20,8 @@ check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
 # really in libqtest, not in the testcases themselves.
 check-qtest-i386-y = tests/rtc-test
 check-qtest-x86_64-y = $(check-qtest-i386-y)
+check-qtest-sparc-y = tests/m48t59-test$(EXESUF)
+check-qtest-sparc64-y = tests/m48t59-test$(EXESUF)
 
 GENERATED_HEADERS += tests/test-qapi-types.h tests/test-qapi-visit.h tests/test-qmp-commands.h
 
@@ -64,6 +66,7 @@ tests/test-qmp-input-strict$(EXESUF): tests/test-qmp-input-strict.o $(test-qapi-
 tests/test-qmp-commands$(EXESUF): tests/test-qmp-commands.o tests/test-qmp-marshal.o $(test-qapi-obj-y)
 
 tests/rtc-test$(EXESUF): tests/rtc-test.o $(trace-obj-y)
+tests/m48t59-test$(EXESUF): tests/m48t59-test.o $(trace-obj-y)
 
 # QTest rules
 

tests/m48t59-test.c

@@ -0,0 +1,259 @@
+/*
+ * QTest testcase for the M48T59 and M48T08 real-time clocks
+ *
+ * Based on MC146818 RTC test:
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+#include "libqtest.h"
+
+#include <glib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#define RTC_SECONDS             0x9
+#define RTC_MINUTES             0xa
+#define RTC_HOURS               0xb
+
+#define RTC_DAY_OF_WEEK         0xc
+#define RTC_DAY_OF_MONTH        0xd
+#define RTC_MONTH               0xe
+#define RTC_YEAR                0xf
+
+static uint32_t base;
+static uint16_t reg_base = 0x1ff0; /* 0x7f0 for m48t02 */
+static int base_year;
+static bool use_mmio;
+
+static uint8_t cmos_read_mmio(uint8_t reg)
+{
+    uint8_t data;
+
+    memread(base + (uint32_t)reg_base + (uint32_t)reg, &data, 1);
+    return data;
+}
+
+static void cmos_write_mmio(uint8_t reg, uint8_t val)
+{
+    uint8_t data = val;
+
+    memwrite(base + (uint32_t)reg_base + (uint32_t)reg, &data, 1);
+}
+
+static uint8_t cmos_read_ioio(uint8_t reg)
+{
+    outw(base + 0, reg_base + (uint16_t)reg);
+    return inb(base + 3);
+}
+
+static void cmos_write_ioio(uint8_t reg, uint8_t val)
+{
+    outw(base + 0, reg_base + (uint16_t)reg);
+    outb(base + 3, val);
+}
+
+static uint8_t cmos_read(uint8_t reg)
+{
+    if (use_mmio) {
+        return cmos_read_mmio(reg);
+    } else {
+        return cmos_read_ioio(reg);
+    }
+}
+
+static void cmos_write(uint8_t reg, uint8_t val)
+{
+    if (use_mmio) {
+        cmos_write_mmio(reg, val);
+    } else {
+        cmos_write_ioio(reg, val);
+    }
+}
+
+static int bcd2dec(int value)
+{
+    return (((value >> 4) & 0x0F) * 10) + (value & 0x0F);
+}
+
+static int tm_cmp(struct tm *lhs, struct tm *rhs)
+{
+    time_t a, b;
+    struct tm d1, d2;
+
+    memcpy(&d1, lhs, sizeof(d1));
+    memcpy(&d2, rhs, sizeof(d2));
+
+    a = mktime(&d1);
+    b = mktime(&d2);
+
+    if (a < b) {
+        return -1;
+    } else if (a > b) {
+        return 1;
+    }
+
+    return 0;
+}
+
+#if 0
+static void print_tm(struct tm *tm)
+{
+    printf("%04d-%02d-%02d %02d:%02d:%02d %+02ld\n",
+           tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
+           tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff);
+}
+#endif
+
+static void cmos_get_date_time(struct tm *date)
+{
+    int sec, min, hour, mday, mon, year;
+    time_t ts;
+    struct tm dummy;
+
+    sec = cmos_read(RTC_SECONDS);
+    min = cmos_read(RTC_MINUTES);
+    hour = cmos_read(RTC_HOURS);
+    mday = cmos_read(RTC_DAY_OF_MONTH);
+    mon = cmos_read(RTC_MONTH);
+    year = cmos_read(RTC_YEAR);
+
+    sec = bcd2dec(sec);
+    min = bcd2dec(min);
+    hour = bcd2dec(hour);
+    mday = bcd2dec(mday);
+    mon = bcd2dec(mon);
+    year = bcd2dec(year);
+
+    ts = time(NULL);
+    localtime_r(&ts, &dummy);
+
+    date->tm_isdst = dummy.tm_isdst;
+    date->tm_sec = sec;
+    date->tm_min = min;
+    date->tm_hour = hour;
+    date->tm_mday = mday;
+    date->tm_mon = mon - 1;
+    date->tm_year = base_year + year - 1900;
+    date->tm_gmtoff = 0;
+
+    ts = mktime(date);
+}
+
+static void check_time(int wiggle)
+{
+    struct tm start, date[4], end;
+    struct tm *datep;
+    time_t ts;
+
+    /*
+     * This check assumes a few things.  First, we cannot guarantee that we get
+     * a consistent reading from the wall clock because we may hit an edge of
+     * the clock while reading.  To work around this, we read four clock readings
+     * such that at least two of them should match.  We need to assume that one
+     * reading is corrupt so we need four readings to ensure that we have at
+     * least two consecutive identical readings
+     *
+     * It's also possible that we'll cross an edge reading the host clock so
+     * simply check to make sure that the clock reading is within the period of
+     * when we expect it to be.
+     */
+
+    ts = time(NULL);
+    gmtime_r(&ts, &start);
+
+    cmos_get_date_time(&date[0]);
+    cmos_get_date_time(&date[1]);
+    cmos_get_date_time(&date[2]);
+    cmos_get_date_time(&date[3]);
+
+    ts = time(NULL);
+    gmtime_r(&ts, &end);
+
+    if (tm_cmp(&date[0], &date[1]) == 0) {
+        datep = &date[0];
+    } else if (tm_cmp(&date[1], &date[2]) == 0) {
+        datep = &date[1];
+    } else if (tm_cmp(&date[2], &date[3]) == 0) {
+        datep = &date[2];
+    } else {
+        g_assert_not_reached();
+    }
+
+    if (!(tm_cmp(&start, datep) <= 0 && tm_cmp(datep, &end) <= 0)) {
+        long t, s;
+
+        start.tm_isdst = datep->tm_isdst;
+
+        t = (long)mktime(datep);
+        s = (long)mktime(&start);
+        if (t < s) {
+            g_test_message("RTC is %ld second(s) behind wall-clock\n", (s - t));
+        } else {
+            g_test_message("RTC is %ld second(s) ahead of wall-clock\n", (t - s));
+        }
+
+        g_assert_cmpint(ABS(t - s), <=, wiggle);
+    }
+}
+
+static int wiggle = 2;
+
+static void bcd_check_time(void)
+{
+    if (strcmp(qtest_get_arch(), "sparc64") == 0) {
+        base = 0x74;
+        base_year = 1900;
+        use_mmio = false;
+    } else if (strcmp(qtest_get_arch(), "sparc") == 0) {
+        base = 0x71200000;
+        base_year = 1968;
+        use_mmio = true;
+    } else { /* PPC: need to map macio in PCI */
+        g_assert_not_reached();
+    }
+    check_time(wiggle);
+}
+
+/* success if no crash or abort */
+static void fuzz_registers(void)
+{
+    unsigned int i;
+
+    for (i = 0; i < 1000; i++) {
+        uint8_t reg, val;
+
+        reg = (uint8_t)g_test_rand_int_range(0, 16);
+        val = (uint8_t)g_test_rand_int_range(0, 256);
+
+        cmos_write(reg, val);
+        cmos_read(reg);
+    }
+}
+
+int main(int argc, char **argv)
+{
+    QTestState *s = NULL;
+    int ret;
+
+    g_test_init(&argc, &argv, NULL);
+
+    s = qtest_start("-display none -rtc clock=vm");
+
+    qtest_add_func("/rtc/bcd/check-time", bcd_check_time);
+    qtest_add_func("/rtc/fuzz-registers", fuzz_registers);
+    ret = g_test_run();
+
+    if (s) {
+        qtest_quit(s);
+    }
+
+    return ret;
+}