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77 lines
1.4 KiB
77 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include "../cpuflags.h" |
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#include "../string.h" |
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#include "../io.h" |
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#include "error.h" |
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#include <vdso/limits.h> |
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#include <uapi/asm/vmx.h> |
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#include <asm/shared/tdx.h> |
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/* Called from __tdx_hypercall() for unrecoverable failure */ |
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void __tdx_hypercall_failed(void) |
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{ |
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error("TDVMCALL failed. TDX module bug?"); |
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} |
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static inline unsigned int tdx_io_in(int size, u16 port) |
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{ |
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struct tdx_hypercall_args args = { |
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.r10 = TDX_HYPERCALL_STANDARD, |
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.r11 = EXIT_REASON_IO_INSTRUCTION, |
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.r12 = size, |
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.r13 = 0, |
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.r14 = port, |
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}; |
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if (__tdx_hypercall(&args, TDX_HCALL_HAS_OUTPUT)) |
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return UINT_MAX; |
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return args.r11; |
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} |
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static inline void tdx_io_out(int size, u16 port, u32 value) |
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{ |
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struct tdx_hypercall_args args = { |
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.r10 = TDX_HYPERCALL_STANDARD, |
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.r11 = EXIT_REASON_IO_INSTRUCTION, |
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.r12 = size, |
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.r13 = 1, |
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.r14 = port, |
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.r15 = value, |
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}; |
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__tdx_hypercall(&args, 0); |
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} |
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static inline u8 tdx_inb(u16 port) |
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{ |
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return tdx_io_in(1, port); |
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} |
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static inline void tdx_outb(u8 value, u16 port) |
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{ |
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tdx_io_out(1, port, value); |
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} |
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static inline void tdx_outw(u16 value, u16 port) |
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{ |
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tdx_io_out(2, port, value); |
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} |
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void early_tdx_detect(void) |
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{ |
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u32 eax, sig[3]; |
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cpuid_count(TDX_CPUID_LEAF_ID, 0, &eax, &sig[0], &sig[2], &sig[1]); |
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if (memcmp(TDX_IDENT, sig, sizeof(sig))) |
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return; |
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/* Use hypercalls instead of I/O instructions */ |
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pio_ops.f_inb = tdx_inb; |
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pio_ops.f_outb = tdx_outb; |
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pio_ops.f_outw = tdx_outw; |
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}
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