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u-boot/arch/arm/include/asm/system.h
Sergey Temerkhanov a5b9fa30ce armv8: Add Secure Monitor/Hypervisor Call (SMC/HVC) infrastructure 
This commit adds functions issuing calls to secure monitor or
hypervisore. This allows using services such as Power State
Coordination Interface (PSCI) provided by firmware, e.g. ARM
Trusted Firmware (ATF)

The SMC call can destroy all registers declared temporary by the
calling conventions. The clobber list is "x0..x17" because of
this

Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
2016-01-19 22:25:36 +00:00

347 lines
9.1 KiB
C
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#ifndef __ASM_ARM_SYSTEM_H
#define __ASM_ARM_SYSTEM_H
#include <common.h>
#include <linux/compiler.h>
#ifdef CONFIG_ARM64
/*
* SCTLR_EL1/SCTLR_EL2/SCTLR_EL3 bits definitions
*/
#define CR_M (1 << 0) /* MMU enable */
#define CR_A (1 << 1) /* Alignment abort enable */
#define CR_C (1 << 2) /* Dcache enable */
#define CR_SA (1 << 3) /* Stack Alignment Check Enable */
#define CR_I (1 << 12) /* Icache enable */
#define CR_WXN (1 << 19) /* Write Permision Imply XN */
#define CR_EE (1 << 25) /* Exception (Big) Endian */
#ifndef CONFIG_SYS_FULL_VA
#define PGTABLE_SIZE (0x10000)
#else
#define PGTABLE_SIZE CONFIG_SYS_PGTABLE_SIZE
#endif
/* 2MB granularity */
#define MMU_SECTION_SHIFT 21
#define MMU_SECTION_SIZE (1 << MMU_SECTION_SHIFT)
#ifndef __ASSEMBLY__
enum dcache_option {
DCACHE_OFF = 0x3,
};
#define isb() \
({asm volatile( \
"isb" : : : "memory"); \
})
#define wfi() \
({asm volatile( \
"wfi" : : : "memory"); \
})
static inline unsigned int current_el(void)
{
unsigned int el;
asm volatile("mrs %0, CurrentEL" : "=r" (el) : : "cc");
return el >> 2;
}
static inline unsigned int get_sctlr(void)
{
unsigned int el, val;
el = current_el();
if (el == 1)
asm volatile("mrs %0, sctlr_el1" : "=r" (val) : : "cc");
else if (el == 2)
asm volatile("mrs %0, sctlr_el2" : "=r" (val) : : "cc");
else
asm volatile("mrs %0, sctlr_el3" : "=r" (val) : : "cc");
return val;
}
static inline void set_sctlr(unsigned int val)
{
unsigned int el;
el = current_el();
if (el == 1)
asm volatile("msr sctlr_el1, %0" : : "r" (val) : "cc");
else if (el == 2)
asm volatile("msr sctlr_el2, %0" : : "r" (val) : "cc");
else
asm volatile("msr sctlr_el3, %0" : : "r" (val) : "cc");
asm volatile("isb");
}
static inline unsigned long read_mpidr(void)
{
unsigned long val;
asm volatile("mrs %0, mpidr_el1" : "=r" (val));
return val;
}
#define BSP_COREID 0
void __asm_flush_dcache_all(void);
void __asm_invalidate_dcache_all(void);
void __asm_flush_dcache_range(u64 start, u64 end);
void __asm_invalidate_tlb_all(void);
void __asm_invalidate_icache_all(void);
int __asm_flush_l3_cache(void);
void armv8_switch_to_el2(void);
void armv8_switch_to_el1(void);
void gic_init(void);
void gic_send_sgi(unsigned long sgino);
void wait_for_wakeup(void);
void protect_secure_region(void);
void smp_kick_all_cpus(void);
void flush_l3_cache(void);
/*
*Issue a hypervisor call in accordance with ARM "SMC Calling convention",
* DEN0028A
*
* @args: input and output arguments
*
*/
void hvc_call(struct pt_regs *args);
/*
*Issue a secure monitor call in accordance with ARM "SMC Calling convention",
* DEN0028A
*
* @args: input and output arguments
*
*/
void smc_call(struct pt_regs *args);
#endif /* __ASSEMBLY__ */
#else /* CONFIG_ARM64 */
#ifdef __KERNEL__
#define CPU_ARCH_UNKNOWN 0
#define CPU_ARCH_ARMv3 1
#define CPU_ARCH_ARMv4 2
#define CPU_ARCH_ARMv4T 3
#define CPU_ARCH_ARMv5 4
#define CPU_ARCH_ARMv5T 5
#define CPU_ARCH_ARMv5TE 6
#define CPU_ARCH_ARMv5TEJ 7
#define CPU_ARCH_ARMv6 8
#define CPU_ARCH_ARMv7 9
/*
* CR1 bits (CP#15 CR1)
*/
#define CR_M (1 << 0) /* MMU enable */
#define CR_A (1 << 1) /* Alignment abort enable */
#define CR_C (1 << 2) /* Dcache enable */
#define CR_W (1 << 3) /* Write buffer enable */
#define CR_P (1 << 4) /* 32-bit exception handler */
#define CR_D (1 << 5) /* 32-bit data address range */
#define CR_L (1 << 6) /* Implementation defined */
#define CR_B (1 << 7) /* Big endian */
#define CR_S (1 << 8) /* System MMU protection */
#define CR_R (1 << 9) /* ROM MMU protection */
#define CR_F (1 << 10) /* Implementation defined */
#define CR_Z (1 << 11) /* Implementation defined */
#define CR_I (1 << 12) /* Icache enable */
#define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
#define CR_RR (1 << 14) /* Round Robin cache replacement */
#define CR_L4 (1 << 15) /* LDR pc can set T bit */
#define CR_DT (1 << 16)
#define CR_IT (1 << 18)
#define CR_ST (1 << 19)
#define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */
#define CR_U (1 << 22) /* Unaligned access operation */
#define CR_XP (1 << 23) /* Extended page tables */
#define CR_VE (1 << 24) /* Vectored interrupts */
#define CR_EE (1 << 25) /* Exception (Big) Endian */
#define CR_TRE (1 << 28) /* TEX remap enable */
#define CR_AFE (1 << 29) /* Access flag enable */
#define CR_TE (1 << 30) /* Thumb exception enable */
#ifndef PGTABLE_SIZE
#define PGTABLE_SIZE (4096 * 4)
#endif
/*
* This is used to ensure the compiler did actually allocate the register we
* asked it for some inline assembly sequences. Apparently we can't trust
* the compiler from one version to another so a bit of paranoia won't hurt.
* This string is meant to be concatenated with the inline asm string and
* will cause compilation to stop on mismatch.
* (for details, see gcc PR 15089)
*/
#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
#ifndef __ASSEMBLY__
/**
* save_boot_params() - Save boot parameters before starting reset sequence
*
* If you provide this function it will be called immediately U-Boot starts,
* both for SPL and U-Boot proper.
*
* All registers are unchanged from U-Boot entry. No registers need be
* preserved.
*
* This is not a normal C function. There is no stack. Return by branching to
* save_boot_params_ret.
*
* void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3);
*/
/**
* save_boot_params_ret() - Return from save_boot_params()
*
* If you provide save_boot_params(), then you should jump back to this
* function when done. Try to preserve all registers.
*
* If your implementation of save_boot_params() is in C then it is acceptable
* to simply call save_boot_params_ret() at the end of your function. Since
* there is no link register set up, you cannot just exit the function. U-Boot
* will return to the (initialised) value of lr, and likely crash/hang.
*
* If your implementation of save_boot_params() is in assembler then you
* should use 'b' or 'bx' to return to save_boot_params_ret.
*/
void save_boot_params_ret(void);
#define isb() __asm__ __volatile__ ("" : : : "memory")
#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
#ifdef __ARM_ARCH_7A__
#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
#else
#define wfi()
#endif
static inline unsigned int get_cr(void)
{
unsigned int val;
asm volatile("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
return val;
}
static inline void set_cr(unsigned int val)
{
asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
: : "r" (val) : "cc");
isb();
}
static inline unsigned int get_dacr(void)
{
unsigned int val;
asm("mrc p15, 0, %0, c3, c0, 0 @ get DACR" : "=r" (val) : : "cc");
return val;
}
static inline void set_dacr(unsigned int val)
{
asm volatile("mcr p15, 0, %0, c3, c0, 0 @ set DACR"
: : "r" (val) : "cc");
isb();
}
#ifdef CONFIG_ARMV7
/* Short-Descriptor Translation Table Level 1 Bits */
#define TTB_SECT_NS_MASK (1 << 19)
#define TTB_SECT_NG_MASK (1 << 17)
#define TTB_SECT_S_MASK (1 << 16)
/* Note: TTB AP bits are set elsewhere */
#define TTB_SECT_TEX(x) ((x & 0x7) << 12)
#define TTB_SECT_DOMAIN(x) ((x & 0xf) << 5)
#define TTB_SECT_XN_MASK (1 << 4)
#define TTB_SECT_C_MASK (1 << 3)
#define TTB_SECT_B_MASK (1 << 2)
#define TTB_SECT (2 << 0)
/* options available for data cache on each page */
enum dcache_option {
DCACHE_OFF = TTB_SECT_S_MASK | TTB_SECT_DOMAIN(0) |
TTB_SECT_XN_MASK | TTB_SECT,
DCACHE_WRITETHROUGH = DCACHE_OFF | TTB_SECT_C_MASK,
DCACHE_WRITEBACK = DCACHE_WRITETHROUGH | TTB_SECT_B_MASK,
DCACHE_WRITEALLOC = DCACHE_WRITEBACK | TTB_SECT_TEX(1),
};
#else
/* options available for data cache on each page */
enum dcache_option {
DCACHE_OFF = 0x12,
DCACHE_WRITETHROUGH = 0x1a,
DCACHE_WRITEBACK = 0x1e,
DCACHE_WRITEALLOC = 0x16,
};
#endif
/* Size of an MMU section */
enum {
MMU_SECTION_SHIFT = 20,
MMU_SECTION_SIZE = 1 << MMU_SECTION_SHIFT,
};
#ifdef CONFIG_ARMV7
/* TTBR0 bits */
#define TTBR0_BASE_ADDR_MASK 0xFFFFC000
#define TTBR0_RGN_NC (0 << 3)
#define TTBR0_RGN_WBWA (1 << 3)
#define TTBR0_RGN_WT (2 << 3)
#define TTBR0_RGN_WB (3 << 3)
/* TTBR0[6] is IRGN[0] and TTBR[0] is IRGN[1] */
#define TTBR0_IRGN_NC (0 << 0 | 0 << 6)
#define TTBR0_IRGN_WBWA (0 << 0 | 1 << 6)
#define TTBR0_IRGN_WT (1 << 0 | 0 << 6)
#define TTBR0_IRGN_WB (1 << 0 | 1 << 6)
#endif
/**
* Register an update to the page tables, and flush the TLB
*
* \param start start address of update in page table
* \param stop stop address of update in page table
*/
void mmu_page_table_flush(unsigned long start, unsigned long stop);
#endif /* __ASSEMBLY__ */
#define arch_align_stack(x) (x)
#endif /* __KERNEL__ */
#endif /* CONFIG_ARM64 */
#ifndef __ASSEMBLY__
/**
* Change the cache settings for a region.
*
* \param start start address of memory region to change
* \param size size of memory region to change
* \param option dcache option to select
*/
void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
enum dcache_option option);
#ifdef CONFIG_SYS_NONCACHED_MEMORY
void noncached_init(void);
phys_addr_t noncached_alloc(size_t size, size_t align);
#endif /* CONFIG_SYS_NONCACHED_MEMORY */
#endif /* __ASSEMBLY__ */
#endif
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