^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /******************************************************************************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * hypercall.S
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Xen hypercall wrappers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Citrix, 2012
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This program is free software; you can redistribute it and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * modify it under the terms of the GNU General Public License version 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * as published by the Free Software Foundation; or, when distributed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * separately from the Linux kernel or incorporated into other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * software packages, subject to the following license:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Permission is hereby granted, free of charge, to any person obtaining a copy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * of this source file (the "Software"), to deal in the Software without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * restriction, including without limitation the rights to use, copy, modify,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * merge, publish, distribute, sublicense, and/or sell copies of the Software,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * and to permit persons to whom the Software is furnished to do so, subject to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * the following conditions:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * The above copyright notice and this permission notice shall be included in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * all copies or substantial portions of the Software.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * IN THE SOFTWARE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * The Xen hypercall calling convention is very similar to the procedure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * call standard for the ARM 64-bit architecture: the first parameter is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * passed in x0, the second in x1, the third in x2, the fourth in x3 and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * the fifth in x4.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * The hypercall number is passed in x16.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * The return value is in x0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * The hvc ISS is required to be 0xEA1, that is the Xen specific ARM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * hypercall tag.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) * Parameter structs passed to hypercalls are laid out according to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * the ARM 64-bit EABI standard.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <asm/assembler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <asm/asm-uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <xen/interface/xen.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #define XEN_IMM 0xEA1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #define HYPERCALL_SIMPLE(hypercall) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) SYM_FUNC_START(HYPERVISOR_##hypercall) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) mov x16, #__HYPERVISOR_##hypercall; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) hvc XEN_IMM; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ret; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) SYM_FUNC_END(HYPERVISOR_##hypercall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #define HYPERCALL0 HYPERCALL_SIMPLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define HYPERCALL1 HYPERCALL_SIMPLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #define HYPERCALL2 HYPERCALL_SIMPLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define HYPERCALL3 HYPERCALL_SIMPLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #define HYPERCALL4 HYPERCALL_SIMPLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #define HYPERCALL5 HYPERCALL_SIMPLE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) .text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) HYPERCALL2(xen_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) HYPERCALL3(console_io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) HYPERCALL3(grant_table_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) HYPERCALL2(sched_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) HYPERCALL2(event_channel_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) HYPERCALL2(hvm_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) HYPERCALL2(memory_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) HYPERCALL2(physdev_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) HYPERCALL3(vcpu_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) HYPERCALL1(tmem_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) HYPERCALL1(platform_op_raw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) HYPERCALL2(multicall);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) HYPERCALL2(vm_assist);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) HYPERCALL3(dm_op);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) SYM_FUNC_START(privcmd_call)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) mov x16, x0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) mov x0, x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) mov x1, x2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) mov x2, x3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) mov x3, x4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) mov x4, x5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * Privcmd calls are issued by the userspace. The kernel needs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * enable access to TTBR0_EL1 as the hypervisor would issue stage 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * translations to user memory via AT instructions. Since AT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * instructions are not affected by the PAN bit (ARMv8.1), we only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * need the explicit uaccess_enable/disable if the TTBR0 PAN emulation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * is enabled (it implies that hardware UAO and PAN disabled).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) uaccess_ttbr0_enable x6, x7, x8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) hvc XEN_IMM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * Disable userspace access from kernel once the hyp call completed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) uaccess_ttbr0_disable x6, x7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) ret
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) SYM_FUNC_END(privcmd_call);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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