87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
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/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <hypervisor.h>
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#include <hv_lib.h>
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#include <acrn_common.h>
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#include <hv_arch.h>
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#include <hv_debug.h>
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#define CMOS_ADDR_PORT 0x70U
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#define CMOS_DATA_PORT 0x71U
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#define RTC_STATUSA 0x0AU /* status register A */
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#define RTCSA_TUP 0x80U /* time update, don't look now */
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static spinlock_t cmos_lock = { .head = 0U, .tail = 0U };
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static uint8_t cmos_read(uint8_t addr)
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{
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pio_write8(addr, CMOS_ADDR_PORT);
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return pio_read8(CMOS_DATA_PORT);
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}
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static bool cmos_update_in_progress(void)
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{
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return (cmos_read(RTC_STATUSA) & RTCSA_TUP)?1:0;
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}
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static uint8_t cmos_get_reg_val(uint8_t addr)
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{
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uint8_t reg;
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int tries = 2000U;
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spinlock_obtain(&cmos_lock);
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/* Make sure an update isn't in progress */
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while (cmos_update_in_progress() && tries--)
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;
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reg = cmos_read(addr);
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spinlock_release(&cmos_lock);
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return reg;
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}
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static uint32_t vrtc_read(__unused struct vm_io_handler *hdlr, struct vm *vm,
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uint16_t addr, __unused size_t width)
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{
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uint8_t reg;
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uint8_t offset;
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offset = vm->vrtc_offset;
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if (addr == CMOS_ADDR_PORT) {
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return vm->vrtc_offset;
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}
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reg = cmos_get_reg_val(offset);
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return reg;
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}
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static void vrtc_write(__unused struct vm_io_handler *hdlr, struct vm *vm, uint16_t addr,
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size_t width, uint32_t value)
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{
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if (width != 1U)
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return;
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if (addr == CMOS_ADDR_PORT) {
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vm->vrtc_offset = value & 0x7FU;
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}
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}
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void vrtc_init(struct vm *vm)
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{
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struct vm_io_range range = {
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.flags = IO_ATTR_RW, .base = CMOS_ADDR_PORT, .len = 2U};
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/* Initializing the CMOS RAM offset to 0U */
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vm->vrtc_offset = 0U;
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register_io_emulation_handler(vm, &range, vrtc_read, vrtc_write);
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}
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