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dm: vrtc: add memory configuration in RTC CMOS

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Some firmware (e.g. UEFI) uses RTC CMOS to fetch the system's memory
configuration. Put lowmem / highmem info in the designated area.

This is a port of Bhyve vRTC's user-space logic.

v1 -> v2:
* move KB/MB/GB to macros.h
* move nvram offset definitions to rtc.h

Tracked-On: #1390
Signed-off-by: Peter Fang <peter.fang@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Peter Fang
2018-09-25 16:13:14 -07:00
committed by Xie, Nanlin
parent 373e79bb52
commit 1657544152
4 changed files with 34 additions and 4 deletions
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24
devicemodel/hw/platform/rtc.c
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@@ -1147,6 +1147,8 @@ int
vrtc_init(struct vmctx *ctx)
{
struct vrtc *vrtc;
size_t lomem, himem;
int err;
struct rtcdev *rtc;
time_t curtime;
sigset_t mask;
@@ -1160,6 +1162,28 @@ vrtc_init(struct vmctx *ctx)
pthread_mutex_init(&vrtc->mtx, NULL);
/*
* 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
*/
lomem = vm_get_lowmem_size(ctx);
assert(lomem >= 16 * MB);
lomem = (lomem - 16 * MB) / (64 * KB);
err = vrtc_nvram_write(vrtc, RTC_LMEM_LSB, lomem);
assert(err == 0);
err = vrtc_nvram_write(vrtc, RTC_LMEM_MSB, lomem >> 8);
assert(err == 0);
himem = vm_get_highmem_size(ctx) / (64 * KB);
err = vrtc_nvram_write(vrtc, RTC_HMEM_LSB, himem);
assert(err == 0);
err = vrtc_nvram_write(vrtc, RTC_HMEM_SB, himem >> 8);
assert(err == 0);
err = vrtc_nvram_write(vrtc, RTC_HMEM_MSB, himem >> 16);
assert(err == 0);
memset(&rtc_addr, 0, sizeof(struct inout_port));
memset(&rtc_data, 0, sizeof(struct inout_port));
/*register io port handler for rtc addr*/