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