linux-kernel - MM: Query about different memory types(mem_types)_

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:	Tue, 7 Jul 2015 09:44:13 +0530
From:	Sumit Gupta <sumit.g.007@...il.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: MM: Query about different memory types(mem_types)__mmu.c

Hi All,

I have been exploring ARM reference manual about ARM weak memory model
and mmu page table setting from some time.
I think i understand different memory types, mmu settings for
page/section, TEX, AP, B, C, S bits well.
My target is to to dig further and fully understand setting of all
parameters for different memory types in ARM
[File mmu.c: "static struct mem_type mem_types"].

But i am not able to find any good source to refer for fully
understanding all below parameters.
Could you please help me to understand mappings for below mem types.
If you can point me to some references which can help me understand
more.

Thank you in advance for your help.


        [MT_DEVICE] = {           /* Strongly ordered / ARMv6 shared device */
                .prot_pte       = PROT_PTE_DEVICE | L_PTE_MT_DEV_SHARED |
                                  L_PTE_SHARED,
                .prot_pte_s2    = s2_policy(PROT_PTE_S2_DEVICE) |
                                  s2_policy(L_PTE_S2_MT_DEV_SHARED) |
                                  L_PTE_SHARED,
                .prot_l1        = PMD_TYPE_TABLE,
                .prot_sect      = PROT_SECT_DEVICE | PMD_SECT_S,
                .domain         = DOMAIN_IO,
        },
............
       [MT_MEMORY_RW] = {
                .prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
                             L_PTE_XN,
                .prot_l1   = PMD_TYPE_TABLE,
                .prot_sect = PMD_TYPE_SECT | PMD_SECT_AP_WRITE,
                .domain    = DOMAIN_KERNEL,
        },
............
        [MT_MEMORY_DMA_READY] = {
                .prot_pte  = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY |
                                L_PTE_XN,
                .prot_l1   = PMD_TYPE_TABLE,
                .domain    = DOMAIN_KERNEL,
        },

Regards,
Sumit Gupta
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/