diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-10-15 12:02:47 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-10-22 15:22:03 +1100 |
| commit | 0b2859a74306b2b89f6e77c216fe0992ff890fa6 (patch) | |
| tree | 2917d67cd6bffe07782e1ac053ee10750d3f2182 /arch/powerpc | |
| parent | 52bda69ae8b5102fe08c9db10f4a1514478e07d3 (diff) | |
powerpc/fsl_booke: Allocate separate TLBCAMs for readonly memory
Reorganise TLBCAM allocation so that when STRICT_KERNEL_RWX is
enabled, TLBCAMs are allocated such that readonly memory uses
different TLBCAMs.
This results in an allocation looking like:
Memory CAM mapping: 4/4/4/1/1/1/1/16/16/16/64/64/64/256/256 Mb, residual: 256Mb
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8ca169bc288261a0e0558712f979023c3a960ebb.1634292136.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/mm/nohash/fsl_book3e.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/arch/powerpc/mm/nohash/fsl_book3e.c b/arch/powerpc/mm/nohash/fsl_book3e.c index 375b2b8238c1..c1bc11f46344 100644 --- a/arch/powerpc/mm/nohash/fsl_book3e.c +++ b/arch/powerpc/mm/nohash/fsl_book3e.c @@ -171,15 +171,34 @@ static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt, { int i; unsigned long amount_mapped = 0; + unsigned long boundary; + + if (strict_kernel_rwx_enabled()) + boundary = (unsigned long)(_sinittext - _stext); + else + boundary = ram; /* Calculate CAM values */ - for (i = 0; ram && i < max_cam_idx; i++) { + for (i = 0; boundary && i < max_cam_idx; i++) { + unsigned long cam_sz; + pgprot_t prot = PAGE_KERNEL_X; + + cam_sz = calc_cam_sz(boundary, virt, phys); + if (!dryrun) + settlbcam(i, virt, phys, cam_sz, pgprot_val(prot), 0); + + boundary -= cam_sz; + amount_mapped += cam_sz; + virt += cam_sz; + phys += cam_sz; + } + for (ram -= amount_mapped; ram && i < max_cam_idx; i++) { unsigned long cam_sz; + pgprot_t prot = PAGE_KERNEL_X; cam_sz = calc_cam_sz(ram, virt, phys); if (!dryrun) - settlbcam(i, virt, phys, cam_sz, - pgprot_val(PAGE_KERNEL_X), 0); + settlbcam(i, virt, phys, cam_sz, pgprot_val(prot), 0); ram -= cam_sz; amount_mapped += cam_sz; |