2 * Copyright (C) 2012 ARM Ltd.
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 * The arm64 hcall implementation uses x0 to specify the hcall type. A value
23 * less than 0xfff indicates a special hcall, such as get/set vector.
24 * Any other value is used as a pointer to the function to call.
27 /* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */
28 #define HVC_GET_VECTORS 0
31 * HVC_SET_VECTORS - Set the value of the vbar_el2 register.
33 * @x1: Physical address of the new vector table.
35 #define HVC_SET_VECTORS 1
37 #define BOOT_CPU_MODE_EL1 (0xe11)
38 #define BOOT_CPU_MODE_EL2 (0xe12)
42 #include <asm/ptrace.h>
45 * __boot_cpu_mode records what mode CPUs were booted in.
46 * A correctly-implemented bootloader must start all CPUs in the same mode:
47 * In this case, both 32bit halves of __boot_cpu_mode will contain the
48 * same value (either 0 if booted in EL1, BOOT_CPU_MODE_EL2 if booted in EL2).
50 * Should the bootloader fail to do this, the two values will be different.
51 * This allows the kernel to flag an error when the secondaries have come up.
53 extern u32 __boot_cpu_mode[2];
55 void __hyp_set_vectors(phys_addr_t phys_vector_base);
56 phys_addr_t __hyp_get_vectors(void);
58 /* Reports the availability of HYP mode */
59 static inline bool is_hyp_mode_available(void)
61 return (__boot_cpu_mode[0] == BOOT_CPU_MODE_EL2 &&
62 __boot_cpu_mode[1] == BOOT_CPU_MODE_EL2);
65 /* Check if the bootloader has booted CPUs in different modes */
66 static inline bool is_hyp_mode_mismatched(void)
68 return __boot_cpu_mode[0] != __boot_cpu_mode[1];
71 static inline bool is_kernel_in_hyp_mode(void)
75 asm("mrs %0, CurrentEL" : "=r" (el));
76 return el == CurrentEL_EL2;
79 /* The section containing the hypervisor text */
80 extern char __hyp_text_start[];
81 extern char __hyp_text_end[];
83 #endif /* __ASSEMBLY__ */
85 #endif /* ! __ASM__VIRT_H */