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freebsd-skq/usr.sbin/bhyve/rtc.c
grehan 0725ad64f5 Changes required for OpenBSD/amd64: 
- Allow a hostbridge to be created with AMD as a vendor.
  This passes the OpenBSD check to allow the use of MSI
  on a PCI bus.
- Enable the i/o interrupt section of the mptable, and
  populate it with unity ISA mappings. This allows the
  'legacy' IRQ mappings of the PCI serial port to be
  set up. Delete unused print routine that was obscuring code.
- Use the '-W' option to enable virtio single-vector MSI
  rather than an environment variable. Update the virtio
  net/block drivers to query this flag when setting up
  interrupts.: bhyverun.c
- Fix the arithmetic used to derive the century byte in
  RTC CMOS, as well as encoding it in BCD.

Reviewed by:	neel
MFC after:	3 days
2013-10-17 22:01:17 +00:00

361 lines
8.4 KiB
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/*-
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <assert.h>
#include <machine/vmm.h>
#include <vmmapi.h>
#include "inout.h"
#include "rtc.h"
#define IO_RTC 0x70
#define RTC_SEC 0x00 /* seconds */
#define RTC_SEC_ALARM 0x01
#define RTC_MIN 0x02
#define RTC_MIN_ALARM 0x03
#define RTC_HRS 0x04
#define RTC_HRS_ALARM 0x05
#define RTC_WDAY 0x06
#define RTC_DAY 0x07
#define RTC_MONTH 0x08
#define RTC_YEAR 0x09
#define RTC_CENTURY 0x32 /* current century */
#define RTC_STATUSA 0xA
#define RTCSA_TUP 0x80 /* time update, don't look now */
#define RTC_STATUSB 0xB
#define RTCSB_DST 0x01
#define RTCSB_24HR 0x02
#define RTCSB_BIN 0x04 /* 0 = BCD, 1 = Binary */
#define RTCSB_PINTR 0x40 /* 1 = enable periodic clock interrupt */
#define RTCSB_HALT 0x80 /* stop clock updates */
#define RTC_INTR 0x0c /* status register C (R) interrupt source */
#define RTC_STATUSD 0x0d /* status register D (R) Lost Power */
#define RTCSD_PWR 0x80 /* clock power OK */
#define RTC_NVRAM_START 0x0e
#define RTC_NVRAM_END 0x7f
#define RTC_NVRAM_SZ (128 - RTC_NVRAM_START)
#define nvoff(x) ((x) - RTC_NVRAM_START)
#define RTC_DIAG 0x0e
#define RTC_RSTCODE 0x0f
#define RTC_EQUIPMENT 0x14
#define RTC_LMEM_LSB 0x34
#define RTC_LMEM_MSB 0x35
#define RTC_HMEM_LSB 0x5b
#define RTC_HMEM_SB 0x5c
#define RTC_HMEM_MSB 0x5d
#define m_64KB (64*1024)
#define m_16MB (16*1024*1024)
#define m_4GB (4ULL*1024*1024*1024)
static int addr;
static uint8_t rtc_nvram[RTC_NVRAM_SZ];
/* XXX initialize these to default values as they would be from BIOS */
static uint8_t status_a, status_b;
static struct {
uint8_t hours;
uint8_t mins;
uint8_t secs;
} rtc_alarm;
static u_char const bin2bcd_data[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99
};
#define bin2bcd(bin) (bin2bcd_data[bin])
#define rtcout(val) ((status_b & RTCSB_BIN) ? (val) : bin2bcd((val)))
static void
timevalfix(struct timeval *t1)
{
if (t1->tv_usec < 0) {
t1->tv_sec--;
t1->tv_usec += 1000000;
}
if (t1->tv_usec >= 1000000) {
t1->tv_sec++;
t1->tv_usec -= 1000000;
}
}
static void
timevalsub(struct timeval *t1, const struct timeval *t2)
{
t1->tv_sec -= t2->tv_sec;
t1->tv_usec -= t2->tv_usec;
timevalfix(t1);
}
static int
rtc_addr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
uint32_t *eax, void *arg)
{
if (bytes != 1)
return (-1);
if (in) {
/* straight read of this register will return 0xFF */
*eax = 0xff;
return (0);
}
switch (*eax & 0x7f) {
case RTC_SEC:
case RTC_SEC_ALARM:
case RTC_MIN:
case RTC_MIN_ALARM:
case RTC_HRS:
case RTC_HRS_ALARM:
case RTC_WDAY:
case RTC_DAY:
case RTC_MONTH:
case RTC_YEAR:
case RTC_STATUSA:
case RTC_STATUSB:
case RTC_INTR:
case RTC_STATUSD:
case RTC_NVRAM_START ... RTC_NVRAM_END:
break;
default:
return (-1);
}
addr = *eax & 0x7f;
return (0);
}
static int
rtc_data_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
uint32_t *eax, void *arg)
{
int hour;
time_t t;
struct timeval cur, delta;
static struct timeval last;
static struct tm tm;
if (bytes != 1)
return (-1);
gettimeofday(&cur, NULL);
/*
* Increment the cached time only once per second so we can guarantee
* that the guest has at least one second to read the hour:min:sec
* separately and still get a coherent view of the time.
*/
delta = cur;
timevalsub(&delta, &last);
if (delta.tv_sec >= 1 && (status_b & RTCSB_HALT) == 0) {
t = cur.tv_sec;
localtime_r(&t, &tm);
last = cur;
}
if (in) {
switch (addr) {
case RTC_SEC_ALARM:
*eax = rtc_alarm.secs;
break;
case RTC_MIN_ALARM:
*eax = rtc_alarm.mins;
break;
case RTC_HRS_ALARM:
*eax = rtc_alarm.hours;
break;
case RTC_SEC:
*eax = rtcout(tm.tm_sec);
return (0);
case RTC_MIN:
*eax = rtcout(tm.tm_min);
return (0);
case RTC_HRS:
if (status_b & RTCSB_24HR)
hour = tm.tm_hour;
else
hour = (tm.tm_hour % 12) + 1;
*eax = rtcout(hour);
/*
* If we are representing time in the 12-hour format
* then set the MSB to indicate PM.
*/
if ((status_b & RTCSB_24HR) == 0 && tm.tm_hour >= 12)
*eax |= 0x80;
return (0);
case RTC_WDAY:
*eax = rtcout(tm.tm_wday + 1);
return (0);
case RTC_DAY:
*eax = rtcout(tm.tm_mday);
return (0);
case RTC_MONTH:
*eax = rtcout(tm.tm_mon + 1);
return (0);
case RTC_YEAR:
*eax = rtcout(tm.tm_year % 100);
return (0);
case RTC_STATUSA:
*eax = status_a;
return (0);
case RTC_STATUSB:
*eax = status_b;
return (0);
case RTC_INTR:
*eax = 0;
return (0);
case RTC_STATUSD:
*eax = RTCSD_PWR;
return (0);
case RTC_NVRAM_START ... RTC_NVRAM_END:
*eax = rtc_nvram[addr - RTC_NVRAM_START];
return (0);
default:
return (-1);
}
}
switch (addr) {
case RTC_STATUSA:
status_a = *eax & ~RTCSA_TUP;
break;
case RTC_STATUSB:
/* XXX not implemented yet XXX */
if (*eax & RTCSB_PINTR)
return (-1);
status_b = *eax;
break;
case RTC_STATUSD:
/* ignore write */
break;
case RTC_SEC_ALARM:
rtc_alarm.secs = *eax;
break;
case RTC_MIN_ALARM:
rtc_alarm.mins = *eax;
break;
case RTC_HRS_ALARM:
rtc_alarm.hours = *eax;
break;
case RTC_SEC:
case RTC_MIN:
case RTC_HRS:
case RTC_WDAY:
case RTC_DAY:
case RTC_MONTH:
case RTC_YEAR:
/*
* Ignore writes to the time of day registers
*/
break;
case RTC_NVRAM_START ... RTC_NVRAM_END:
rtc_nvram[addr - RTC_NVRAM_START] = *eax;
break;
default:
return (-1);
}
return (0);
}
void
rtc_init(struct vmctx *ctx)
{
struct timeval cur;
struct tm tm;
size_t himem;
size_t lomem;
int err;
err = gettimeofday(&cur, NULL);
assert(err == 0);
(void) localtime_r(&cur.tv_sec, &tm);
memset(rtc_nvram, 0, sizeof(rtc_nvram));
rtc_nvram[nvoff(RTC_CENTURY)] = bin2bcd((tm.tm_year + 1900) / 100);
/* XXX init diag/reset code/equipment/checksum ? */
/*
* Report guest memory size in nvram cells as required by UEFI.
* Little-endian encoding.
* 0x34/0x35 - 64KB chunks above 16MB, below 4GB
* 0x5b/0x5c/0x5d - 64KB chunks above 4GB
*/
err = vm_get_memory_seg(ctx, 0, &lomem, NULL);
assert(err == 0);
lomem = (lomem - m_16MB) / m_64KB;
rtc_nvram[nvoff(RTC_LMEM_LSB)] = lomem;
rtc_nvram[nvoff(RTC_LMEM_MSB)] = lomem >> 8;
if (vm_get_memory_seg(ctx, m_4GB, &himem, NULL) == 0) {
himem /= m_64KB;
rtc_nvram[nvoff(RTC_HMEM_LSB)] = himem;
rtc_nvram[nvoff(RTC_HMEM_SB)] = himem >> 8;
rtc_nvram[nvoff(RTC_HMEM_MSB)] = himem >> 16;
}
}
INOUT_PORT(rtc, IO_RTC, IOPORT_F_INOUT, rtc_addr_handler);
INOUT_PORT(rtc, IO_RTC + 1, IOPORT_F_INOUT, rtc_data_handler);
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