[RFC 1/6] arm64: hibernate: Introduce new entry point to kernel
From: Vivek Kumar <hidden>
Date: 2022-05-18 07:49:19
Also in:
linux-block, linux-doc, linux-mm, linux-pm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Introduce a new entry point to hibernated kernel image. This is generally needed when bootloader restores the hibernated image from disc to ddr and passes control to it by turning off the mmu, also initialize this new entry point with cpu_resume which turns on the mmu and then proceeds with restore routines. Signed-off-by: Vivek Kumar <redacted> Signed-off-by: Prasanna Kumar <redacted> --- arch/arm64/kernel/hibernate.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 6328308..4e294b3 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c@@ -74,6 +74,14 @@ static struct arch_hibernate_hdr { void (*reenter_kernel)(void); /* + * Another entry point if jump to kernel happens with mmu disabled, + * generally done when restoring hibernation image from bootloader + * context + */ + + phys_addr_t phys_reenter_kernel; + + /* * We need to know where the __hyp_stub_vectors are after restore to * re-configure el2. */
@@ -116,6 +124,7 @@ int arch_hibernation_header_save(void *addr, unsigned int max_size) arch_hdr_invariants(&hdr->invariants); hdr->ttbr1_el1 = __pa_symbol(swapper_pg_dir); hdr->reenter_kernel = _cpu_resume; + hdr->phys_reenter_kernel = __pa(cpu_resume); /* We can't use __hyp_get_vectors() because kvm may still be loaded */ if (el2_reset_needed())
--
2.7.4
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