[U-Boot] [PATCH 2/5] arm: Add support for HYP mode and LPAE page tables
Alexander Graf
agraf at suse.de
Tue Mar 15 18:21:45 CET 2016
Signed-off-by: Alexander Graf <agraf at suse.de>
---
arch/arm/include/asm/system.h | 99 ++++++++++++++++++++++++++++++++++++++++---
arch/arm/lib/cache-cp15.c | 66 ++++++++++++++++++++++++++---
2 files changed, 153 insertions(+), 12 deletions(-)
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 832c1db..9d0f32b 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -176,7 +176,9 @@ void smc_call(struct pt_regs *args);
#define CR_AFE (1 << 29) /* Access flag enable */
#define CR_TE (1 << 30) /* Thumb exception enable */
-#ifndef PGTABLE_SIZE
+#if defined(CONFIG_SYS_ARM_LPAE) && !defined(PGTABLE_SIZE)
+#define PGTABLE_SIZE (4096 * 5)
+#elif !defined(PGTABLE_SIZE)
#define PGTABLE_SIZE (4096 * 4)
#endif
@@ -233,17 +235,50 @@ void save_boot_params_ret(void);
#define wfi()
#endif
+static inline unsigned long get_cpsr(void)
+{
+ unsigned long cpsr;
+
+ asm volatile("mrs %0, cpsr" : "=r"(cpsr): );
+ return cpsr;
+}
+
+static inline int is_hyp(void)
+{
+#ifdef CONFIG_SYS_ARM_LPAE
+ /* HYP mode requires LPAE ... */
+ return ((get_cpsr() & 0x1f) == 0x1a);
+#else
+ /* ... so without LPAE support we can optimize all hyp code away */
+ return 0;
+#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");
+
+ if (is_hyp())
+ asm volatile("mrc p15, 4, %0, c1, c0, 0 @ get CR" : "=r" (val)
+ :
+ : "cc");
+ else
+ 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");
+ if (is_hyp())
+ asm volatile("mcr p15, 4, %0, c1, c0, 0 @ set CR" :
+ : "r" (val)
+ : "cc");
+ else
+ asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR" :
+ : "r" (val)
+ : "cc");
isb();
}
@@ -261,12 +296,59 @@ static inline void set_dacr(unsigned int val)
isb();
}
-#ifdef CONFIG_CPU_V7
+#ifdef CONFIG_SYS_ARM_LPAE
+/* Long-Descriptor Translation Table Level 1/2 Bits */
+#define TTB_SECT_XN_MASK (1ULL << 54)
+#define TTB_SECT_NG_MASK (1 << 11)
+#define TTB_SECT_AF (1 << 10)
+#define TTB_SECT_SH_MASK (3 << 8)
+#define TTB_SECT_NS_MASK (1 << 5)
+#define TTB_SECT_AP (1 << 6)
+/* Note: TTB AP bits are set elsewhere */
+#define TTB_SECT_MAIR(x) ((x & 0x7) << 2) /* Index into MAIR */
+#define TTB_SECT (1 << 0)
+#define TTB_PAGETABLE (3 << 0)
+
+/* TTBCR flags */
+#define TTBCR_EAE (1 << 31)
+#define TTBCR_T0SZ(x) ((x) << 0)
+#define TTBCR_T1SZ(x) ((x) << 16)
+#define TTBCR_USING_TTBR0 (TTBCR_T0SZ(0) | TTBCR_T1SZ(0))
+#define TTBCR_IRGN0_NC (0 << 8)
+#define TTBCR_IRGN0_WBWA (1 << 8)
+#define TTBCR_IRGN0_WT (2 << 8)
+#define TTBCR_IRGN0_WBNWA (3 << 8)
+#define TTBCR_IRGN0_MASK (3 << 8)
+#define TTBCR_ORGN0_NC (0 << 10)
+#define TTBCR_ORGN0_WBWA (1 << 10)
+#define TTBCR_ORGN0_WT (2 << 10)
+#define TTBCR_ORGN0_WBNWA (3 << 10)
+#define TTBCR_ORGN0_MASK (3 << 10)
+#define TTBCR_SHARED_NON (0 << 12)
+#define TTBCR_SHARED_OUTER (2 << 12)
+#define TTBCR_SHARED_INNER (3 << 12)
+#define TTBCR_EPD0 (0 << 7)
+
+/*
+ * Memory types
+ */
+#define MEMORY_ATTRIBUTES ((0x00 << (0 * 8)) | (0x88 << (1 * 8)) | \
+ (0xcc << (2 * 8)) | (0xff << (3 * 8)))
+
+/* options available for data cache on each page */
+enum dcache_option {
+ DCACHE_OFF = TTB_SECT | TTB_SECT_MAIR(0),
+ DCACHE_WRITETHROUGH = TTB_SECT | TTB_SECT_MAIR(1),
+ DCACHE_WRITEBACK = TTB_SECT | TTB_SECT_MAIR(2),
+ DCACHE_WRITEALLOC = TTB_SECT | TTB_SECT_MAIR(3),
+};
+#elif defined(CONFIG_CPU_V7)
/* 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_AP (3 << 10)
#define TTB_SECT_TEX(x) ((x & 0x7) << 12)
#define TTB_SECT_DOMAIN(x) ((x & 0xf) << 5)
#define TTB_SECT_XN_MASK (1 << 4)
@@ -282,6 +364,7 @@ enum dcache_option {
DCACHE_WRITEALLOC = DCACHE_WRITEBACK | TTB_SECT_TEX(1),
};
#else
+#define TTB_SECT_AP (3 << 10)
/* options available for data cache on each page */
enum dcache_option {
DCACHE_OFF = 0x12,
@@ -293,7 +376,11 @@ enum dcache_option {
/* Size of an MMU section */
enum {
- MMU_SECTION_SHIFT = 20,
+#ifdef CONFIG_SYS_ARM_LPAE
+ MMU_SECTION_SHIFT = 21, /* 2MB */
+#else
+ MMU_SECTION_SHIFT = 20, /* 1MB */
+#endif
MMU_SECTION_SIZE = 1 << MMU_SECTION_SHIFT,
};
diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c
index 8e18538..849cb89 100644
--- a/arch/arm/lib/cache-cp15.c
+++ b/arch/arm/lib/cache-cp15.c
@@ -34,11 +34,22 @@ static void cp_delay (void)
void set_section_dcache(int section, enum dcache_option option)
{
+#ifdef CONFIG_SYS_ARM_LPAE
+ u64 *page_table = (u64 *)gd->arch.tlb_addr;
+ /* Need to set the access flag to not fault */
+ u64 value = TTB_SECT_AP | TTB_SECT_AF;
+#else
u32 *page_table = (u32 *)gd->arch.tlb_addr;
- u32 value;
+ u32 value = TTB_SECT_AP;
+#endif
+
+ /* Add the page offset */
+ value |= ((u32)section << MMU_SECTION_SHIFT);
- value = (section << MMU_SECTION_SHIFT) | (3 << 10);
+ /* Add caching bits */
value |= option;
+
+ /* Set PTE */
page_table[section] = value;
}
@@ -68,8 +79,9 @@ __weak void dram_bank_mmu_setup(int bank)
int i;
debug("%s: bank: %d\n", __func__, bank);
- for (i = bd->bi_dram[bank].start >> 20;
- i < (bd->bi_dram[bank].start >> 20) + (bd->bi_dram[bank].size >> 20);
+ for (i = bd->bi_dram[bank].start >> MMU_SECTION_SHIFT;
+ i < (bd->bi_dram[bank].start >> MMU_SECTION_SHIFT) +
+ (bd->bi_dram[bank].size >> MMU_SECTION_SHIFT);
i++) {
#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
set_section_dcache(i, DCACHE_WRITETHROUGH);
@@ -89,14 +101,56 @@ static inline void mmu_setup(void)
arm_init_before_mmu();
/* Set up an identity-mapping for all 4GB, rw for everyone */
- for (i = 0; i < 4096; i++)
+ for (i = 0; i < ((4096ULL * 1024 * 1024) >> MMU_SECTION_SHIFT); i++)
set_section_dcache(i, DCACHE_OFF);
for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
dram_bank_mmu_setup(i);
}
-#ifdef CONFIG_CPU_V7
+#ifdef CONFIG_SYS_ARM_LPAE
+ /* Set up 4 PTE entries pointing to our 4 1GB page tables */
+ for (i = 0; i < 4; i++) {
+ u64 *page_table = (u64 *)(gd->arch.tlb_addr + (4096 * 4));
+ u64 tpt = gd->arch.tlb_addr + (4096 * i);
+ page_table[i] = tpt | TTB_PAGETABLE;
+ }
+
+ reg = TTBCR_EAE;
+#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
+ reg |= TTBCR_ORGN0_WT | TTBCR_IRGN0_WT;
+#elif defined(CONFIG_SYS_ARM_CACHE_WRITEALLOC)
+ reg |= TTBCR_ORGN0_WBWA | TTBCR_IRGN0_WBWA;
+#else
+ reg |= TTBCR_ORGN0_WBNWA | TTBCR_IRGN0_WBNWA;
+#endif
+
+ if (is_hyp()) {
+ /* Set HCTR to enable LPAE */
+ asm volatile("mcr p15, 4, %0, c2, c0, 2"
+ : : "r" (reg) : "memory");
+ /* Set HTTBR0 */
+ asm volatile("mcrr p15, 4, %0, %1, c2"
+ :
+ : "r"(gd->arch.tlb_addr + (4096 * 4)), "r"(0)
+ : "memory");
+ /* Set HMAIR */
+ asm volatile("mcr p15, 4, %0, c10, c2, 0"
+ : : "r" (MEMORY_ATTRIBUTES) : "memory");
+ } else {
+ /* Set TTBCR to enable LPAE */
+ asm volatile("mcr p15, 0, %0, c2, c0, 2"
+ : : "r" (reg) : "memory");
+ /* Set 64-bit TTBR0 */
+ asm volatile("mcrr p15, 0, %0, %1, c2"
+ :
+ : "r"(gd->arch.tlb_addr + (4096 * 4)), "r"(0)
+ : "memory");
+ /* Set MAIR */
+ asm volatile("mcr p15, 0, %0, c10, c2, 0"
+ : : "r" (MEMORY_ATTRIBUTES) : "memory");
+ }
+#elif defined(CONFIG_CPU_V7)
/* Set TTBR0 */
reg = gd->arch.tlb_addr & TTBR0_BASE_ADDR_MASK;
#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
--
1.8.5.6
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