/******************************************************************************
* arch-arm.h
*
* Guest OS interface to ARM Xen.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Copyright 2011 (C) Citrix Systems
*/
#ifndef __XEN_PUBLIC_ARCH_ARM_H__
#define __XEN_PUBLIC_ARCH_ARM_H__
/*
* `incontents 50 arm_abi Hypercall Calling Convention
*
* A hypercall is issued using the ARM HVC instruction.
*
* A hypercall can take up to 5 arguments. These are passed in
* registers, the first argument in x0/r0 (for arm64/arm32 guests
* respectively irrespective of whether the underlying hypervisor is
* 32- or 64-bit), the second argument in x1/r1, the third in x2/r2,
* the forth in x3/r3 and the fifth in x4/r4.
*
* The hypercall number is passed in r12 (arm) or x16 (arm64). In both
* cases the relevant ARM procedure calling convention specifies this
* is an inter-procedure-call scratch register (e.g. for use in linker
* stubs). This use does not conflict with use during a hypercall.
*
* The HVC ISS must contain a Xen specific TAG: XEN_HYPERCALL_TAG.
*
* The return value is in x0/r0.
*
* The hypercall will clobber x16/r12 and the argument registers used
* by that hypercall (except r0 which is the return value) i.e. in
* addition to x16/r12 a 2 argument hypercall will clobber x1/r1 and a
* 4 argument hypercall will clobber x1/r1, x2/r2 and x3/r3.
*
* Parameter structs passed to hypercalls are laid out according to
* the Procedure Call Standard for the ARM Architecture (AAPCS, AKA
* EABI) and Procedure Call Standard for the ARM 64-bit Architecture
* (AAPCS64). Where there is a conflict the 64-bit standard should be
* used regardless of guest type. Structures which are passed as
* hypercall arguments are always little endian.
*
* All memory which is shared with other entities in the system
* (including the hypervisor and other guests) must reside in memory
* which is mapped as Normal Inner-cacheable. This applies to:
* - hypercall arguments passed via a pointer to guest memory.
* - memory shared via the grant table mechanism (including PV I/O
* rings etc).
* - memory shared with the hypervisor (struct shared_info, struct
* vcpu_info, the grant table, etc).
*
* Any Inner cache allocation strategy (Write-Back, Write-Through etc)
* is acceptable. There is no restriction on the Outer-cacheability.
*/
/*
* `incontents 55 arm_hcall Supported Hypercalls
*
* Xen on ARM makes extensive use of hardware facilities and therefore
* only a subset of the potential hypercalls are required.
*
* Since ARM uses second stage paging any machine/physical addresses
* passed to hypercalls are Guest Physical Addresses (Intermediate
* Physical Addresses) unless otherwise noted.
*
* The following hypercalls (and sub operations) are supported on the
* ARM platform. Other hypercalls should be considered
* unavailable/unsupported.
*
* HYPERVISOR_memory_op
* All generic sub-operations.
*
* In addition the following arch specific sub-ops:
* * XENMEM_add_to_physmap
* * XENMEM_add_to_physmap_batch
*
* HYPERVISOR_domctl
* All generic sub-operations, with the exception of:
* * XEN_DOMCTL_iomem_permission (not yet implemented)
* * XEN_DOMCTL_irq_permission (not yet implemented)
*
* HYPERVISOR_sched_op
* All generic sub-operations, with the exception of:
* * SCHEDOP_block -- prefer wfi hardware instruction
*
* HYPERVISOR_console_io
* All generic sub-operations
*
* HYPERVISOR_xen_version
* All generic sub-operations
*
* HYPERVISOR_event_channel_op
* All generic sub-operations
*
* HYPERVISOR_physdev_op
* No sub-operations are currenty supported
*
* HYPERVISOR_sysctl
* All generic sub-operations, with the exception of:
* * XEN_SYSCTL_page_offline_op
* * XEN_SYSCTL_get_pmstat
* * XEN_SYSCTL_pm_op
*
* HYPERVISOR_hvm_op
* Exactly these sub-operations are supported:
* * HVMOP_set_param
* * HVMOP_get_param
*
* HYPERVISOR_grant_table_op
* All generic sub-operations
*
* HYPERVISOR_vcpu_op
* Exactly these sub-operations are supported:
* * VCPUOP_register_vcpu_info
* * VCPUOP_register_runstate_memory_area
*
*
* Other notes on the ARM ABI:
*
* - struct start_info is not exported to ARM guests.
*
* - struct shared_info is mapped by ARM guests using the
* HYPERVISOR_memory_op sub-op XENMEM_add_to_physmap, passing
* XENMAPSPACE_shared_info as space parameter.
*
* - All the per-cpu struct vcpu_info are mapped by ARM guests using the
* HYPERVISOR_vcpu_op sub-op VCPUOP_register_vcpu_info, including cpu0
* struct vcpu_info.
*
* - The grant table is mapped using the HYPERVISOR_memory_op sub-op
* XENMEM_add_to_physmap, passing XENMAPSPACE_grant_table as space
* parameter. The memory range specified under the Xen compatible
* hypervisor node on device tree can be used as target gpfn for the
* mapping.
*
* - Xenstore is initialized by using the two hvm_params
* HVM_PARAM_STORE_PFN and HVM_PARAM_STORE_EVTCHN. They can be read
* with the HYPERVISOR_hvm_op sub-op HVMOP_get_param.
*
* - The paravirtualized console is initialized by using the two
* hvm_params HVM_PARAM_CONSOLE_PFN and HVM_PARAM_CONSOLE_EVTCHN. They
* can be read with the HYPERVISOR_hvm_op sub-op HVMOP_get_param.
*
* - Event channel notifications are delivered using the percpu GIC
* interrupt specified under the Xen compatible hypervisor node on
* device tree.
*
* - The device tree Xen compatible node is fully described under Linux
* at Documentation/devicetree/bindings/arm/xen.txt.
*/
#define XEN_HYPERCALL_TAG 0XEA1
#define uint64_aligned_t uint64_t __attribute__((aligned(8)))
#ifndef __ASSEMBLY__
#define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
typedef union { type *p; unsigned long q; } \
__guest_handle_ ## name; \
typedef union { type *p; uint64_aligned_t q; } \
__guest_handle_64_ ## name;
/*
* XEN_GUEST_HANDLE represents a guest pointer, when passed as a field
* in a struct in memory. On ARM is always 8 bytes sizes and 8 bytes
* aligned.
* XEN_GUEST_HANDLE_PARAM represent a guest pointer, when passed as an
* hypercall argument. It is 4 bytes on aarch and 8 bytes on aarch64.
*/
#define __DEFINE_XEN_GUEST_HANDLE(name, type) \
___DEFINE_XEN_GUEST_HANDLE(name, type); \
___DEFINE_XEN_GUEST_HANDLE(const_##name, const type)
#define DEFINE_XEN_GUEST_HANDLE(name) __DEFINE_XEN_GUEST_HANDLE(name, name)
#define __XEN_GUEST_HANDLE(name) __guest_handle_64_ ## name
#define XEN_GUEST_HANDLE(name) __XEN_GUEST_HANDLE(name)
/* this is going to be changed on 64 bit */
#define XEN_GUEST_HANDLE_PARAM(name) __guest_handle_ ## name
#define set_xen_guest_handle_raw(hnd, val) \
do { \
typeof(&(hnd)) _sxghr_tmp = &(hnd); \
_sxghr_tmp->q = 0; \
_sxghr_tmp->p = val; \
} while ( 0 )
#ifdef __XEN_TOOLS__
#define get_xen_guest_handle(val, hnd) do { val = (hnd).p; } while (0)
#endif
#define set_xen_guest_handle(hnd, val) set_xen_guest_handle_raw(hnd, val)
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
/* Anonymous union includes both 32- and 64-bit names (e.g., r0/x0). */
# define __DECL_REG(n64, n32) union { \
uint64_t n64; \
uint32_t n32; \
}
#else
/* Non-gcc sources must always use the proper 64-bit name (e.g., x0). */
#define __DECL_REG(n64, n32) uint64_t n64
#endif
struct vcpu_guest_core_regs
{
/* Aarch64 Aarch32 */
__DECL_REG(x0, r0_usr);
__DECL_REG(x1, r1_usr);
__DECL_REG(x2, r2_usr);
__DECL_REG(x3, r3_usr);
__DECL_REG(x4, r4_usr);
__DECL_REG(x5, r5_usr);
__DECL_REG(x6, r6_usr);
__DECL_REG(x7, r7_usr);
__DECL_REG(x8, r8_usr);
__DECL_REG(x9, r9_usr);
__DECL_REG(x10, r10_usr);
__DECL_REG(x11, r11_usr);
__DECL_REG(x12, r12_usr);
__DECL_REG(x13, sp_usr);
__DECL_REG(x14, lr_usr);
__DECL_REG(x15, __unused_sp_hyp);
__DECL_REG(x16, lr_irq);
__DECL_REG(x17, sp_irq);
__DECL_REG(x18, lr_svc);
__DECL_REG(x19, sp_svc);
__DECL_REG(x20, lr_abt);
__DECL_REG(x21, sp_abt);
__DECL_REG(x22, lr_und);
__DECL_REG(x23, sp_und);
__DECL_REG(x24, r8_fiq);
__DECL_REG(x25, r9_fiq);
__DECL_REG(x26, r10_fiq);
__DECL_REG(x27, r11_fiq);
__DECL_REG(x28, r12_fiq);
__DECL_REG(x29, sp_fiq);
__DECL_REG(x30, lr_fiq);
/* Return address and mode */
__DECL_REG(pc64, pc32); /* ELR_EL2 */
uint32_t cpsr; /* SPSR_EL2 */
union {
uint32_t spsr_el1; /* AArch64 */
uint32_t spsr_svc; /* AArch32 */
};
/* AArch32 guests only */
uint32_t spsr_fiq, spsr_irq, spsr_und, spsr_abt;
/* AArch64 guests only */
uint64_t sp_el0;
uint64_t sp_el1, elr_el1;
};
typedef struct vcpu_guest_core_regs vcpu_guest_core_regs_t;
DEFINE_XEN_GUEST_HANDLE(vcpu_guest_core_regs_t);
#undef __DECL_REG
typedef uint64_t xen_pfn_t;
#define PRI_xen_pfn PRIx64
/* Maximum number of virtual CPUs in legacy multi-processor guests. */
/* Only one. All other VCPUS must use VCPUOP_register_vcpu_info */
#define XEN_LEGACY_MAX_VCPUS 1
typedef uint64_t xen_ulong_t;
#define PRI_xen_ulong PRIx64
#if defined(__XEN__) || defined(__XEN_TOOLS__)
struct vcpu_guest_context {
#define _VGCF_online 0
#define VGCF_online (1<<_VGCF_online)
uint32_t flags; /* VGCF_* */
struct vcpu_guest_core_regs user_regs; /* Core CPU registers */
uint32_t sctlr;
uint64_t ttbcr, ttbr0, ttbr1;
};
typedef struct vcpu_guest_context vcpu_guest_context_t;
DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t);
#endif
struct arch_vcpu_info {
};
typedef struct arch_vcpu_info arch_vcpu_info_t;
struct arch_shared_info {
};
typedef struct arch_shared_info arch_shared_info_t;
typedef uint64_t xen_callback_t;
#endif
#if defined(__XEN__) || defined(__XEN_TOOLS__)
/* PSR bits (CPSR, SPSR)*/
#define PSR_THUMB (1<<5) /* Thumb Mode enable */
#define PSR_FIQ_MASK (1<<6) /* Fast Interrupt mask */
#define PSR_IRQ_MASK (1<<7) /* Interrupt mask */
#define PSR_ABT_MASK (1<<8) /* Asynchronous Abort mask */
#define PSR_BIG_ENDIAN (1<<9) /* arm32: Big Endian Mode */
#define PSR_DBG_MASK (1<<9) /* arm64: Debug Exception mask */
#define PSR_IT_MASK (0x0600fc00) /* Thumb If-Then Mask */
#define PSR_JAZELLE (1<<24) /* Jazelle Mode */
/* 32 bit modes */
#define PSR_MODE_USR 0x10
#define PSR_MODE_FIQ 0x11
#define PSR_MODE_IRQ 0x12
#define PSR_MODE_SVC 0x13
#define PSR_MODE_MON 0x16
#define PSR_MODE_ABT 0x17
#define PSR_MODE_HYP 0x1a
#define PSR_MODE_UND 0x1b
#define PSR_MODE_SYS 0x1f
/* 64 bit modes */
#define PSR_MODE_BIT 0x10 /* Set iff AArch32 */
#define PSR_MODE_EL3h 0x0d
#define PSR_MODE_EL3t 0x0c
#define PSR_MODE_EL2h 0x09
#define PSR_MODE_EL2t 0x08
#define PSR_MODE_EL1h 0x05
#define PSR_MODE_EL1t 0x04
#define PSR_MODE_EL0t 0x00
#define PSR_GUEST32_INIT (PSR_ABT_MASK|PSR_FIQ_MASK|PSR_IRQ_MASK|PSR_MODE_SVC)
#define PSR_GUEST64_INIT (PSR_ABT_MASK|PSR_FIQ_MASK|PSR_IRQ_MASK|PSR_MODE_EL1h)
#define SCTLR_GUEST_INIT 0x00c50078
/*
* Virtual machine platform (memory layout, interrupts)
*
* These are defined for consistency between the tools and the
* hypervisor. Guests must not rely on these hardcoded values but
* should instead use the FDT.
*/
/* Physical Address Space */
#define GUEST_GICD_BASE 0x2c001000ULL
#define GUEST_GICD_SIZE 0x1000ULL
#define GUEST_GICC_BASE 0x2c002000ULL
#define GUEST_GICC_SIZE 0x100ULL
#define GUEST_RAM_BASE 0x80000000ULL /* 768M @ 2GB */
#define GUEST_RAM_SIZE 0x30000000ULL
#define GUEST_GNTTAB_BASE 0xb0000000ULL
#define GUEST_GNTTAB_SIZE 0x00020000ULL
/* Interrupts */
#define GUEST_TIMER_VIRT_PPI 27
#define GUEST_TIMER_PHYS_S_PPI 29
#define GUEST_TIMER_PHYS_NS_PPI 30
#define GUEST_EVTCHN_PPI 31
/* PSCI functions */
#define PSCI_cpu_suspend 0
#define PSCI_cpu_off 1
#define PSCI_cpu_on 2
#define PSCI_migrate 3
#endif
#endif /* __XEN_PUBLIC_ARCH_ARM_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/