Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 156 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
new file mode 100644
index 000000000..f52a2968a
--- /dev/null
+++ b/arch/arm64/include/asm/efi.h
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_EFI_H
+#define _ASM_EFI_H
+
+#include <asm/boot.h>
+#include <asm/cpufeature.h>
+#include <asm/fpsimd.h>
+#include <asm/io.h>
+#include <asm/memory.h>
+#include <asm/mmu_context.h>
+#include <asm/neon.h>
+#include <asm/ptrace.h>
+#include <asm/tlbflush.h>
+
+#ifdef CONFIG_EFI
+extern void efi_init(void);
+#else
+#define efi_init()
+#endif
+
+int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
+int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
+
+#define arch_efi_call_virt_setup()					\
+({									\
+	efi_virtmap_load();						\
+	__efi_fpsimd_begin();						\
+})
+
+#define arch_efi_call_virt(p, f, args...)				\
+({									\
+	efi_##f##_t *__f;						\
+	__f = p->f;							\
+	__efi_rt_asm_wrapper(__f, #f, args);				\
+})
+
+#define arch_efi_call_virt_teardown()					\
+({									\
+	__efi_fpsimd_end();						\
+	efi_virtmap_unload();						\
+})
+
+efi_status_t __efi_rt_asm_wrapper(void *, const char *, ...);
+
+#define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT)
+
+/* arch specific definitions used by the stub code */
+
+/*
+ * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from
+ * start of kernel and may not cross a 2MiB boundary. We set alignment to
+ * 2MiB so we know it won't cross a 2MiB boundary.
+ */
+#define EFI_FDT_ALIGN	SZ_2M   /* used by allocate_new_fdt_and_exit_boot() */
+
+/*
+ * In some configurations (e.g. VMAP_STACK && 64K pages), stacks built into the
+ * kernel need greater alignment than we require the segments to be padded to.
+ */
+#define EFI_KIMG_ALIGN	\
+	(SEGMENT_ALIGN > THREAD_ALIGN ? SEGMENT_ALIGN : THREAD_ALIGN)
+
+/* on arm64, the FDT may be located anywhere in system RAM */
+static inline unsigned long efi_get_max_fdt_addr(unsigned long dram_base)
+{
+	return ULONG_MAX;
+}
+
+/*
+ * On arm64, we have to ensure that the initrd ends up in the linear region,
+ * which is a 1 GB aligned region of size '1UL << (VA_BITS - 1)' that is
+ * guaranteed to cover the kernel Image.
+ *
+ * Since the EFI stub is part of the kernel Image, we can relax the
+ * usual requirements in Documentation/arm64/booting.txt, which still
+ * apply to other bootloaders, and are required for some kernel
+ * configurations.
+ */
+static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
+						    unsigned long image_addr)
+{
+	return (image_addr & ~(SZ_1G - 1UL)) + (1UL << (VA_BITS - 1));
+}
+
+#define efi_call_early(f, ...)		sys_table_arg->boottime->f(__VA_ARGS__)
+#define __efi_call_early(f, ...)	f(__VA_ARGS__)
+#define efi_call_runtime(f, ...)	sys_table_arg->runtime->f(__VA_ARGS__)
+#define efi_is_64bit()			(true)
+
+#define efi_table_attr(table, attr, instance)				\
+	((table##_t *)instance)->attr
+
+#define efi_call_proto(protocol, f, instance, ...)			\
+	((protocol##_t *)instance)->f(instance, ##__VA_ARGS__)
+
+#define alloc_screen_info(x...)		&screen_info
+
+static inline void free_screen_info(efi_system_table_t *sys_table_arg,
+				    struct screen_info *si)
+{
+}
+
+/* redeclare as 'hidden' so the compiler will generate relative references */
+extern struct screen_info screen_info __attribute__((__visibility__("hidden")));
+
+static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
+{
+}
+
+#define EFI_ALLOC_ALIGN		SZ_64K
+
+/*
+ * On ARM systems, virtually remapped UEFI runtime services are set up in two
+ * distinct stages:
+ * - The stub retrieves the final version of the memory map from UEFI, populates
+ *   the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime
+ *   service to communicate the new mapping to the firmware (Note that the new
+ *   mapping is not live at this time)
+ * - During an early initcall(), the EFI system table is permanently remapped
+ *   and the virtual remapping of the UEFI Runtime Services regions is loaded
+ *   into a private set of page tables. If this all succeeds, the Runtime
+ *   Services are enabled and the EFI_RUNTIME_SERVICES bit set.
+ */
+
+static inline void efi_set_pgd(struct mm_struct *mm)
+{
+	__switch_mm(mm);
+
+	if (system_uses_ttbr0_pan()) {
+		if (mm != current->active_mm) {
+			/*
+			 * Update the current thread's saved ttbr0 since it is
+			 * restored as part of a return from exception. Enable
+			 * access to the valid TTBR0_EL1 and invoke the errata
+			 * workaround directly since there is no return from
+			 * exception when invoking the EFI run-time services.
+			 */
+			update_saved_ttbr0(current, mm);
+			uaccess_ttbr0_enable();
+			post_ttbr_update_workaround();
+		} else {
+			/*
+			 * Defer the switch to the current thread's TTBR0_EL1
+			 * until uaccess_enable(). Restore the current
+			 * thread's saved ttbr0 corresponding to its active_mm
+			 */
+			uaccess_ttbr0_disable();
+			update_saved_ttbr0(current, current->active_mm);
+		}
+	}
+}
+
+void efi_virtmap_load(void);
+void efi_virtmap_unload(void);
+
+#endif /* _ASM_EFI_H */