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Diffstat (limited to '')
| -rw-r--r-- | bsps/x86_64/amd64/clock/eficlock.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/bsps/x86_64/amd64/clock/eficlock.c b/bsps/x86_64/amd64/clock/eficlock.c new file mode 100644 index 0000000000..f5ff9278f6 --- /dev/null +++ b/bsps/x86_64/amd64/clock/eficlock.c @@ -0,0 +1,109 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ + +/* + * Copyright (C) 2023 Karel Gardas + * + * 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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. + */ + +#include <bsp.h> +#include <efi.h> + +#include <stdio.h> + +extern EFI_BOOT_SERVICES *BS; + +static EFI_EVENT clock_event = 0; + +extern void +Clock_isr( void* ); + +#ifndef EFIAPI +#error "EFIAPI not defined!" +#endif + + +/* no-sse attribute helps with enforcing GCC to generate code which does not use + SSE instructions requiring 16 byte alligned access on unaligned data hence + producing perfect GP fault. The code with SSE enabled looks: + +EFIAPI void +efi_clock_tick_notify(EFI_EVENT e, VOID* ctx) +{ + 10b2ba: 55 push rbp + 10b2bb: 48 89 e5 mov rbp,rsp + 10b2be: 57 push rdi + 10b2bf: 56 push rsi + 10b2c0: 48 81 ec a0 00 00 00 sub rsp,0xa0 + 10b2c7: 8b 02 mov eax,DWORD PTR [rdx] +->10b2c9: 0f 29 b5 50 ff ff ff movaps XMMWORD PTR [rbp-0xb0],xmm6 + 10b2d0: 0f 29 bd 60 ff ff ff movaps XMMWORD PTR [rbp-0xa0],xmm7 + 10b2d7: 83 c0 01 add eax,0x1 + +and we get GP @ 10b2c9. + +CAVEAT: This function is to be called from the UEFI which means it needs to callable +by using MS ABI! + + */ +__attribute__((target("no-sse"))) +EFIAPI void +efi_clock_tick_notify(EFI_EVENT e, VOID* ctx); + +__attribute__((target("no-sse"))) +EFIAPI void +efi_clock_tick_notify(EFI_EVENT e, VOID* ctx) +{ + Clock_isr(NULL); +} + +static void +efi_clock_initialize( void ) +{ + EFI_STATUS status = BS->CreateEvent + (EVT_TIMER | EVT_NOTIFY_SIGNAL, + TPL_CALLBACK, (EFI_EVENT_NOTIFY)efi_clock_tick_notify, + (VOID*)NULL, &clock_event); + if (EFI_ERROR(status)) { + printf("EFI: error while creating event in clock initialization!\n"); + } + else { + printf("EFI: clock event created.\n"); + /* set periodic timer to signal Clock_isr every 10 milisecond. Value provided + here is following UEFI spec in hundred of nanoseconds. */ + status = BS->SetTimer(clock_event, TimerPeriodic, (10 * 1000 * 10)); + if (EFI_ERROR(status)) { + printf("EFI: error while creating timer in clock initialization!\n"); + BS->CloseEvent(clock_event); + } + else { + printf("EFI: timer for clock event is set.\n"); + } + } +} + +#define Clock_driver_support_initialize_hardware() efi_clock_initialize() + +#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER + +/* Include shared source clock driver code */ +#include "../../shared/dev/clock/clockimpl.h" |