Alexandre Ghiti 2bfc6cd81b riscv: Move kernel mapping outside of linear mapping ... This is a preparatory patch for relocatable kernel and sv48 support. The kernel used to be linked at PAGE_OFFSET address therefore we could use the linear mapping for the kernel mapping. But the relocated kernel base address will be different from PAGE_OFFSET and since in the linear mapping, two different virtual addresses cannot point to the same physical address, the kernel mapping needs to lie outside the linear mapping so that we don't have to copy it at the same physical offset. The kernel mapping is moved to the last 2GB of the address space, BPF is now always after the kernel and modules use the 2GB memory range right before the kernel, so BPF and modules regions do not overlap. KASLR implementation will simply have to move the kernel in the last 2GB range and just take care of leaving enough space for BPF. In addition, by moving the kernel to the end of the address space, both sv39 and sv48 kernels will be exactly the same without needing to be relocated at runtime. Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr> [Palmer: Squash the STRICT_RWX fix, and a !MMU fix] Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2021-04-26 08:25:04 -07:00
..
boot	riscv: Move kernel mapping outside of linear mapping	2021-04-26 08:25:04 -07:00
configs	RISC-V: Enable CPU Hotplug in defconfigs	2021-02-26 21:24:02 -08:00
errata	riscv: sifive: Apply errata "cip-1200" patch	2021-04-26 08:24:58 -07:00
include	riscv: Move kernel mapping outside of linear mapping	2021-04-26 08:25:04 -07:00
kernel	riscv: Move kernel mapping outside of linear mapping	2021-04-26 08:25:04 -07:00
lib	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
mm	riscv: Move kernel mapping outside of linear mapping	2021-04-26 08:25:04 -07:00
net	bpf: Rename BPF_XADD and prepare to encode other atomics in .imm	2021-01-14 18:34:29 -08:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	riscv: Select HAVE_DYNAMIC_FTRACE when -fpatchable-function-entry is available	2021-04-26 08:25:02 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: sifive: Apply errata "cip-1200" patch	2021-04-26 08:24:58 -07:00
Kconfig.socs	riscv: sifive: Add SiFive alternative ports	2021-04-26 08:24:56 -07:00
Makefile	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00