BCD cleanup

Combine multiple BCD implementations.

Signed-off-by: Paul Brook <paul@codesourcery.com>

diff --git a/hw/m48t59.c b/hw/m48t59.c
index bb58419d2ae6c5534d865e8c4e44020b0ebc811a..ce38f8b6ec45dd4778e5ef51cf31fe782d2fdbb8 100644 (file)
--- a/hw/m48t59.c
+++ b/hw/m48t59.c
@@ -80,16 +80,6 @@ typedef struct M48t59SysBusState {
 } M48t59SysBusState;
 
 /* Fake timer functions */
-/* Generic helpers for BCD */
-static inline uint8_t toBCD (uint8_t value)
-{
-    return (((value / 10) % 10) << 4) | (value % 10);
-}
-
-static inline uint8_t fromBCD (uint8_t BCD)
-{
-    return ((BCD >> 4) * 10) + (BCD & 0x0F);
-}
 
 /* Alarm management */
 static void alarm_cb (void *opaque)
@@ -219,7 +209,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
         break;
     case 0x1FF2:
         /* alarm seconds */
-        tmp = fromBCD(val & 0x7F);
+        tmp = from_bcd(val & 0x7F);
         if (tmp >= 0 && tmp <= 59) {
             NVRAM->alarm.tm_sec = tmp;
             NVRAM->buffer[0x1FF2] = val;
@@ -228,7 +218,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
         break;
     case 0x1FF3:
         /* alarm minutes */
-        tmp = fromBCD(val & 0x7F);
+        tmp = from_bcd(val & 0x7F);
         if (tmp >= 0 && tmp <= 59) {
             NVRAM->alarm.tm_min = tmp;
             NVRAM->buffer[0x1FF3] = val;
@@ -237,7 +227,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
         break;
     case 0x1FF4:
         /* alarm hours */
-        tmp = fromBCD(val & 0x3F);
+        tmp = from_bcd(val & 0x3F);
         if (tmp >= 0 && tmp <= 23) {
             NVRAM->alarm.tm_hour = tmp;
             NVRAM->buffer[0x1FF4] = val;
@@ -246,7 +236,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
         break;
     case 0x1FF5:
         /* alarm date */
-        tmp = fromBCD(val & 0x1F);
+        tmp = from_bcd(val & 0x1F);
         if (tmp != 0) {
             NVRAM->alarm.tm_mday = tmp;
             NVRAM->buffer[0x1FF5] = val;
@@ -270,7 +260,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     case 0x1FF9:
     case 0x07F9:
         /* seconds (BCD) */
-       tmp = fromBCD(val & 0x7F);
+       tmp = from_bcd(val & 0x7F);
        if (tmp >= 0 && tmp <= 59) {
            get_time(NVRAM, &tm);
            tm.tm_sec = tmp;
@@ -289,7 +279,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     case 0x1FFA:
     case 0x07FA:
         /* minutes (BCD) */
-       tmp = fromBCD(val & 0x7F);
+       tmp = from_bcd(val & 0x7F);
        if (tmp >= 0 && tmp <= 59) {
            get_time(NVRAM, &tm);
            tm.tm_min = tmp;
@@ -299,7 +289,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     case 0x1FFB:
     case 0x07FB:
         /* hours (BCD) */
-       tmp = fromBCD(val & 0x3F);
+       tmp = from_bcd(val & 0x3F);
        if (tmp >= 0 && tmp <= 23) {
            get_time(NVRAM, &tm);
            tm.tm_hour = tmp;
@@ -309,7 +299,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     case 0x1FFC:
     case 0x07FC:
         /* day of the week / century */
-       tmp = fromBCD(val & 0x07);
+       tmp = from_bcd(val & 0x07);
        get_time(NVRAM, &tm);
        tm.tm_wday = tmp;
        set_time(NVRAM, &tm);
@@ -318,7 +308,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     case 0x1FFD:
     case 0x07FD:
         /* date */
-       tmp = fromBCD(val & 0x1F);
+       tmp = from_bcd(val & 0x1F);
        if (tmp != 0) {
            get_time(NVRAM, &tm);
            tm.tm_mday = tmp;
@@ -328,7 +318,7 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     case 0x1FFE:
     case 0x07FE:
         /* month */
-       tmp = fromBCD(val & 0x1F);
+       tmp = from_bcd(val & 0x1F);
        if (tmp >= 1 && tmp <= 12) {
            get_time(NVRAM, &tm);
            tm.tm_mon = tmp - 1;
@@ -338,13 +328,13 @@ void m48t59_write (void *opaque, uint32_t addr, uint32_t val)
     case 0x1FFF:
     case 0x07FF:
         /* year */
-       tmp = fromBCD(val);
+       tmp = from_bcd(val);
        if (tmp >= 0 && tmp <= 99) {
            get_time(NVRAM, &tm);
             if (NVRAM->type == 8)
-                tm.tm_year = fromBCD(val) + 68; // Base year is 1968
+                tm.tm_year = from_bcd(val) + 68; // Base year is 1968
             else
-                tm.tm_year = fromBCD(val);
+                tm.tm_year = from_bcd(val);
            set_time(NVRAM, &tm);
        }
         break;
@@ -410,19 +400,19 @@ uint32_t m48t59_read (void *opaque, uint32_t addr)
     case 0x07F9:
         /* seconds (BCD) */
         get_time(NVRAM, &tm);
-        retval = (NVRAM->buffer[addr] & 0x80) | toBCD(tm.tm_sec);
+        retval = (NVRAM->buffer[addr] & 0x80) | to_bcd(tm.tm_sec);
         break;
     case 0x1FFA:
     case 0x07FA:
         /* minutes (BCD) */
         get_time(NVRAM, &tm);
-        retval = toBCD(tm.tm_min);
+        retval = to_bcd(tm.tm_min);
         break;
     case 0x1FFB:
     case 0x07FB:
         /* hours (BCD) */
         get_time(NVRAM, &tm);
-        retval = toBCD(tm.tm_hour);
+        retval = to_bcd(tm.tm_hour);
         break;
     case 0x1FFC:
     case 0x07FC:
@@ -434,22 +424,22 @@ uint32_t m48t59_read (void *opaque, uint32_t addr)
     case 0x07FD:
         /* date */
         get_time(NVRAM, &tm);
-        retval = toBCD(tm.tm_mday);
+        retval = to_bcd(tm.tm_mday);
         break;
     case 0x1FFE:
     case 0x07FE:
         /* month */
         get_time(NVRAM, &tm);
-        retval = toBCD(tm.tm_mon + 1);
+        retval = to_bcd(tm.tm_mon + 1);
         break;
     case 0x1FFF:
     case 0x07FF:
         /* year */
         get_time(NVRAM, &tm);
         if (NVRAM->type == 8)
-            retval = toBCD(tm.tm_year - 68); // Base year is 1968
+            retval = to_bcd(tm.tm_year - 68); // Base year is 1968
         else
-            retval = toBCD(tm.tm_year);
+            retval = to_bcd(tm.tm_year);
         break;
     default:
         /* Check lock registers state */

diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
index 61ddf0b35dee7e275d4da73f6084d607a82ee526..b8c7b0c1b8b0f218702d4bba3a619ecac6a67e47 100644 (file)
--- a/hw/mc146818rtc.c
+++ b/hw/mc146818rtc.c
@@ -259,7 +259,7 @@ static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)
     }
 }
 
-static inline int to_bcd(RTCState *s, int a)
+static inline int rtc_to_bcd(RTCState *s, int a)
 {
     if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
         return a;
@@ -268,7 +268,7 @@ static inline int to_bcd(RTCState *s, int a)
     }
 }
 
-static inline int from_bcd(RTCState *s, int a)
+static inline int rtc_from_bcd(RTCState *s, int a)
 {
     if (s->cmos_data[RTC_REG_B] & REG_B_DM) {
         return a;
@@ -281,17 +281,17 @@ static void rtc_set_time(RTCState *s)
 {
     struct tm *tm = &s->current_tm;
 
-    tm->tm_sec = from_bcd(s, s->cmos_data[RTC_SECONDS]);
-    tm->tm_min = from_bcd(s, s->cmos_data[RTC_MINUTES]);
-    tm->tm_hour = from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
+    tm->tm_sec = rtc_from_bcd(s, s->cmos_data[RTC_SECONDS]);
+    tm->tm_min = rtc_from_bcd(s, s->cmos_data[RTC_MINUTES]);
+    tm->tm_hour = rtc_from_bcd(s, s->cmos_data[RTC_HOURS] & 0x7f);
     if (!(s->cmos_data[RTC_REG_B] & 0x02) &&
         (s->cmos_data[RTC_HOURS] & 0x80)) {
         tm->tm_hour += 12;
     }
-    tm->tm_wday = from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
-    tm->tm_mday = from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
-    tm->tm_mon = from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
-    tm->tm_year = from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900;
+    tm->tm_wday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_WEEK]) - 1;
+    tm->tm_mday = rtc_from_bcd(s, s->cmos_data[RTC_DAY_OF_MONTH]);
+    tm->tm_mon = rtc_from_bcd(s, s->cmos_data[RTC_MONTH]) - 1;
+    tm->tm_year = rtc_from_bcd(s, s->cmos_data[RTC_YEAR]) + s->base_year - 1900;
 }
 
 static void rtc_copy_date(RTCState *s)
@@ -299,24 +299,24 @@ static void rtc_copy_date(RTCState *s)
     const struct tm *tm = &s->current_tm;
     int year;
 
-    s->cmos_data[RTC_SECONDS] = to_bcd(s, tm->tm_sec);
-    s->cmos_data[RTC_MINUTES] = to_bcd(s, tm->tm_min);
+    s->cmos_data[RTC_SECONDS] = rtc_to_bcd(s, tm->tm_sec);
+    s->cmos_data[RTC_MINUTES] = rtc_to_bcd(s, tm->tm_min);
     if (s->cmos_data[RTC_REG_B] & 0x02) {
         /* 24 hour format */
-        s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour);
+        s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour);
     } else {
         /* 12 hour format */
-        s->cmos_data[RTC_HOURS] = to_bcd(s, tm->tm_hour % 12);
+        s->cmos_data[RTC_HOURS] = rtc_to_bcd(s, tm->tm_hour % 12);
         if (tm->tm_hour >= 12)
             s->cmos_data[RTC_HOURS] |= 0x80;
     }
-    s->cmos_data[RTC_DAY_OF_WEEK] = to_bcd(s, tm->tm_wday + 1);
-    s->cmos_data[RTC_DAY_OF_MONTH] = to_bcd(s, tm->tm_mday);
-    s->cmos_data[RTC_MONTH] = to_bcd(s, tm->tm_mon + 1);
+    s->cmos_data[RTC_DAY_OF_WEEK] = rtc_to_bcd(s, tm->tm_wday + 1);
+    s->cmos_data[RTC_DAY_OF_MONTH] = rtc_to_bcd(s, tm->tm_mday);
+    s->cmos_data[RTC_MONTH] = rtc_to_bcd(s, tm->tm_mon + 1);
     year = (tm->tm_year - s->base_year) % 100;
     if (year < 0)
         year += 100;
-    s->cmos_data[RTC_YEAR] = to_bcd(s, year);
+    s->cmos_data[RTC_YEAR] = rtc_to_bcd(s, year);
 }
 
 /* month is between 0 and 11. */
@@ -497,7 +497,7 @@ static void rtc_set_date_from_host(RTCState *s)
     qemu_get_timedate(&tm, 0);
     rtc_set_date(s, &tm);
 
-    val = to_bcd(s, (tm.tm_year / 100) + 19);
+    val = rtc_to_bcd(s, (tm.tm_year / 100) + 19);
     rtc_set_memory(s, REG_IBM_CENTURY_BYTE, val);
     rtc_set_memory(s, REG_IBM_PS2_CENTURY_BYTE, val);
 }

diff --git a/hw/omap1.c b/hw/omap1.c
index e9676ecc88fa6b5cd891bfd3df50415efbd7add6..b5d78cd917bd20cb29ef2d456348a08732700e33 100644 (file)
--- a/hw/omap1.c
+++ b/hw/omap1.c
@@ -3358,16 +3358,6 @@ static void omap_rtc_alarm_update(struct omap_rtc_s *s)
         printf("%s: conversion failed\n", __FUNCTION__);
 }
 
-static inline uint8_t omap_rtc_bcd(int num)
-{
-    return ((num / 10) << 4) | (num % 10);
-}
-
-static inline int omap_rtc_bin(uint8_t num)
-{
-    return (num & 15) + 10 * (num >> 4);
-}
-
 static uint32_t omap_rtc_read(void *opaque, target_phys_addr_t addr)
 {
     struct omap_rtc_s *s = (struct omap_rtc_s *) opaque;
@@ -3376,51 +3366,51 @@ static uint32_t omap_rtc_read(void *opaque, target_phys_addr_t addr)
 
     switch (offset) {
     case 0x00: /* SECONDS_REG */
-        return omap_rtc_bcd(s->current_tm.tm_sec);
+        return to_bcd(s->current_tm.tm_sec);
 
     case 0x04: /* MINUTES_REG */
-        return omap_rtc_bcd(s->current_tm.tm_min);
+        return to_bcd(s->current_tm.tm_min);
 
     case 0x08: /* HOURS_REG */
         if (s->pm_am)
             return ((s->current_tm.tm_hour > 11) << 7) |
-                    omap_rtc_bcd(((s->current_tm.tm_hour - 1) % 12) + 1);
+                    to_bcd(((s->current_tm.tm_hour - 1) % 12) + 1);
         else
-            return omap_rtc_bcd(s->current_tm.tm_hour);
+            return to_bcd(s->current_tm.tm_hour);
 
     case 0x0c: /* DAYS_REG */
-        return omap_rtc_bcd(s->current_tm.tm_mday);
+        return to_bcd(s->current_tm.tm_mday);
 
     case 0x10: /* MONTHS_REG */
-        return omap_rtc_bcd(s->current_tm.tm_mon + 1);
+        return to_bcd(s->current_tm.tm_mon + 1);
 
     case 0x14: /* YEARS_REG */
-        return omap_rtc_bcd(s->current_tm.tm_year % 100);
+        return to_bcd(s->current_tm.tm_year % 100);
 
     case 0x18: /* WEEK_REG */
         return s->current_tm.tm_wday;
 
     case 0x20: /* ALARM_SECONDS_REG */
-        return omap_rtc_bcd(s->alarm_tm.tm_sec);
+        return to_bcd(s->alarm_tm.tm_sec);
 
     case 0x24: /* ALARM_MINUTES_REG */
-        return omap_rtc_bcd(s->alarm_tm.tm_min);
+        return to_bcd(s->alarm_tm.tm_min);
 
     case 0x28: /* ALARM_HOURS_REG */
         if (s->pm_am)
             return ((s->alarm_tm.tm_hour > 11) << 7) |
-                    omap_rtc_bcd(((s->alarm_tm.tm_hour - 1) % 12) + 1);
+                    to_bcd(((s->alarm_tm.tm_hour - 1) % 12) + 1);
         else
-            return omap_rtc_bcd(s->alarm_tm.tm_hour);
+            return to_bcd(s->alarm_tm.tm_hour);
 
     case 0x2c: /* ALARM_DAYS_REG */
-        return omap_rtc_bcd(s->alarm_tm.tm_mday);
+        return to_bcd(s->alarm_tm.tm_mday);
 
     case 0x30: /* ALARM_MONTHS_REG */
-        return omap_rtc_bcd(s->alarm_tm.tm_mon + 1);
+        return to_bcd(s->alarm_tm.tm_mon + 1);
 
     case 0x34: /* ALARM_YEARS_REG */
-        return omap_rtc_bcd(s->alarm_tm.tm_year % 100);
+        return to_bcd(s->alarm_tm.tm_year % 100);
 
     case 0x40: /* RTC_CTRL_REG */
         return (s->pm_am << 3) | (s->auto_comp << 2) |
@@ -3459,7 +3449,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
         printf("RTC SEC_REG <-- %02x\n", value);
 #endif
         s->ti -= s->current_tm.tm_sec;
-        s->ti += omap_rtc_bin(value);
+        s->ti += from_bcd(value);
         return;
 
     case 0x04: /* MINUTES_REG */
@@ -3467,7 +3457,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
         printf("RTC MIN_REG <-- %02x\n", value);
 #endif
         s->ti -= s->current_tm.tm_min * 60;
-        s->ti += omap_rtc_bin(value) * 60;
+        s->ti += from_bcd(value) * 60;
         return;
 
     case 0x08: /* HOURS_REG */
@@ -3476,10 +3466,10 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
 #endif
         s->ti -= s->current_tm.tm_hour * 3600;
         if (s->pm_am) {
-            s->ti += (omap_rtc_bin(value & 0x3f) & 12) * 3600;
+            s->ti += (from_bcd(value & 0x3f) & 12) * 3600;
             s->ti += ((value >> 7) & 1) * 43200;
         } else
-            s->ti += omap_rtc_bin(value & 0x3f) * 3600;
+            s->ti += from_bcd(value & 0x3f) * 3600;
         return;
 
     case 0x0c: /* DAYS_REG */
@@ -3487,7 +3477,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
         printf("RTC DAY_REG <-- %02x\n", value);
 #endif
         s->ti -= s->current_tm.tm_mday * 86400;
-        s->ti += omap_rtc_bin(value) * 86400;
+        s->ti += from_bcd(value) * 86400;
         return;
 
     case 0x10: /* MONTHS_REG */
@@ -3495,7 +3485,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
         printf("RTC MTH_REG <-- %02x\n", value);
 #endif
         memcpy(&new_tm, &s->current_tm, sizeof(new_tm));
-        new_tm.tm_mon = omap_rtc_bin(value);
+        new_tm.tm_mon = from_bcd(value);
         ti[0] = mktimegm(&s->current_tm);
         ti[1] = mktimegm(&new_tm);
 
@@ -3505,7 +3495,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
         } else {
             /* A less accurate version */
             s->ti -= s->current_tm.tm_mon * 2592000;
-            s->ti += omap_rtc_bin(value) * 2592000;
+            s->ti += from_bcd(value) * 2592000;
         }
         return;
 
@@ -3514,7 +3504,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
         printf("RTC YRS_REG <-- %02x\n", value);
 #endif
         memcpy(&new_tm, &s->current_tm, sizeof(new_tm));
-        new_tm.tm_year += omap_rtc_bin(value) - (new_tm.tm_year % 100);
+        new_tm.tm_year += from_bcd(value) - (new_tm.tm_year % 100);
         ti[0] = mktimegm(&s->current_tm);
         ti[1] = mktimegm(&new_tm);
 
@@ -3524,7 +3514,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
         } else {
             /* A less accurate version */
             s->ti -= (s->current_tm.tm_year % 100) * 31536000;
-            s->ti += omap_rtc_bin(value) * 31536000;
+            s->ti += from_bcd(value) * 31536000;
         }
         return;
 
@@ -3535,7 +3525,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
 #ifdef ALMDEBUG
         printf("ALM SEC_REG <-- %02x\n", value);
 #endif
-        s->alarm_tm.tm_sec = omap_rtc_bin(value);
+        s->alarm_tm.tm_sec = from_bcd(value);
         omap_rtc_alarm_update(s);
         return;
 
@@ -3543,7 +3533,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
 #ifdef ALMDEBUG
         printf("ALM MIN_REG <-- %02x\n", value);
 #endif
-        s->alarm_tm.tm_min = omap_rtc_bin(value);
+        s->alarm_tm.tm_min = from_bcd(value);
         omap_rtc_alarm_update(s);
         return;
 
@@ -3553,10 +3543,10 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
 #endif
         if (s->pm_am)
             s->alarm_tm.tm_hour =
-                    ((omap_rtc_bin(value & 0x3f)) % 12) +
+                    ((from_bcd(value & 0x3f)) % 12) +
                     ((value >> 7) & 1) * 12;
         else
-            s->alarm_tm.tm_hour = omap_rtc_bin(value);
+            s->alarm_tm.tm_hour = from_bcd(value);
         omap_rtc_alarm_update(s);
         return;
 
@@ -3564,7 +3554,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
 #ifdef ALMDEBUG
         printf("ALM DAY_REG <-- %02x\n", value);
 #endif
-        s->alarm_tm.tm_mday = omap_rtc_bin(value);
+        s->alarm_tm.tm_mday = from_bcd(value);
         omap_rtc_alarm_update(s);
         return;
 
@@ -3572,7 +3562,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
 #ifdef ALMDEBUG
         printf("ALM MON_REG <-- %02x\n", value);
 #endif
-        s->alarm_tm.tm_mon = omap_rtc_bin(value);
+        s->alarm_tm.tm_mon = from_bcd(value);
         omap_rtc_alarm_update(s);
         return;
 
@@ -3580,7 +3570,7 @@ static void omap_rtc_write(void *opaque, target_phys_addr_t addr,
 #ifdef ALMDEBUG
         printf("ALM YRS_REG <-- %02x\n", value);
 #endif
-        s->alarm_tm.tm_year = omap_rtc_bin(value);
+        s->alarm_tm.tm_year = from_bcd(value);
         omap_rtc_alarm_update(s);
         return;
 

diff --git a/hw/twl92230.c b/hw/twl92230.c
index a6c60ba2b817e7d1c41bd8d3de91fc5896654a71..93232da2d5be2eb5d29c7ad309760cb9412b46c5 100644 (file)
--- a/hw/twl92230.c
+++ b/hw/twl92230.c
@@ -183,16 +183,6 @@ static void menelaus_reset(i2c_slave *i2c)
     menelaus_update(s);
 }
 
-static inline uint8_t to_bcd(int val)
-{
-    return ((val / 10) << 4) | (val % 10);
-}
-
-static inline int from_bcd(uint8_t val)
-{
-    return ((val >> 4) * 10) + (val & 0x0f);
-}
-
 static void menelaus_gpio_set(void *opaque, int line, int level)
 {
     MenelausState *s = (MenelausState *) opaque;

diff --git a/qemu-common.h b/qemu-common.h
index b779cfe69d059a3b90159efc77144c0092cf2056..b1e038bd005bc128ca318ac350d4a2d46396b261 100644 (file)
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -248,6 +248,17 @@ void qemu_iovec_from_buffer(QEMUIOVector *qiov, const void *buf, size_t count);
 struct Monitor;
 typedef struct Monitor Monitor;
 
+/* Convert a byte between binary and BCD.  */
+static inline uint8_t to_bcd(uint8_t val)
+{
+    return ((val / 10) << 4) | (val % 10);
+}
+
+static inline uint8_t from_bcd(uint8_t val)
+{
+    return ((val >> 4) * 10) + (val & 0x0f);
+}
+
 #include "module.h"
 
 #endif /* dyngen-exec.h hack */