mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2026-07-11 09:17:18 +00:00
99586e32cc
For data structure types "struct vm", its name is identical with variable name in the same scope. This is a MISRA C violation. Naming convention rule:If the data structure type is used by multi modules, its corresponding logic resource is exposed to external components (such as SOS, UOS), and its name meaning is simplistic (such as vcpu, vm), its name needs prefix "acrn_". The following udpates are made: struct vm *vm-->struct acrn_vm *vm Tracked-On: #861 Signed-off-by: Xiangyang Wu <xiangyang.wu@linux.intel.com>
82 lines
1.5 KiB
C
82 lines
1.5 KiB
C
/*
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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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#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(struct acrn_vm *vm, 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(struct acrn_vm *vm, uint16_t addr, size_t width,
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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 acrn_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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