| // Copyright 2020 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #ifndef ZIRCON_KERNEL_ARCH_X86_INCLUDE_ARCH_KERNEL_ASPACE_H_ |
| #define ZIRCON_KERNEL_ARCH_X86_INCLUDE_ARCH_KERNEL_ASPACE_H_ |
| |
| // NOTE: This is an independent header so it can be #include'd |
| // by a userland test program as well as the kernel source. |
| |
| // Virtual address where the kernel address space begins. |
| // Below this is the user address space. |
| #define KERNEL_ASPACE_BASE 0xffffff8000000000UL // -512GB |
| #define KERNEL_ASPACE_SIZE 0x0000008000000000UL |
| |
| // Virtual address where the user-accessible address space begins. |
| // Below this is wholly inaccessible. |
| #define USER_ASPACE_BASE 0x0000000000200000UL // 2MB |
| |
| // We set the top of user address space to be (1 << 47) - 4k. |
| // See //docs/concepts/kernel/sysret_problem.md for why we subtract 4k here. |
| #define USER_ASPACE_SIZE ((1ULL << 47) - 4096 - USER_ASPACE_BASE) |
| |
| #endif // ZIRCON_KERNEL_ARCH_X86_INCLUDE_ARCH_KERNEL_ASPACE_H_ |
