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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Rouven Czerwinski <r.czerwinski@pengutronix.de>,
	barebox@lists.infradead.org
Subject: Re: [PATCH v2 7/8] ARM: mmu-early: map no-map entries XN & uncached
Date: Thu, 5 Aug 2021 16:24:28 +0200	[thread overview]
Message-ID: <086d5892-9ca1-84d3-05aa-fe16c5a6eccf@pengutronix.de> (raw)
In-Reply-To: <20210803094418.475609-8-r.czerwinski@pengutronix.de>

On 03.08.21 11:44, Rouven Czerwinski wrote:
> Ensure that reserved map entries with the no-map flag are marked as
> uncached and non-execute during the early MMU initialization.
> 
> Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
> ---
>  arch/arm/cpu/mmu-early.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/arch/arm/cpu/mmu-early.c b/arch/arm/cpu/mmu-early.c
> index b985aa455f..9c3f01326b 100644
> --- a/arch/arm/cpu/mmu-early.c
> +++ b/arch/arm/cpu/mmu-early.c
> @@ -3,9 +3,11 @@
>  #include <errno.h>
>  #include <linux/sizes.h>
>  #include <asm/memory.h>
> +#include <asm-generic/memory_layout.h>
>  #include <asm/system.h>
>  #include <asm/cache.h>
>  #include <asm-generic/sections.h>
> +#include <pbl.h>
>  
>  #include "mmu.h"
>  
> @@ -24,7 +26,10 @@ static inline void map_region(unsigned long start, unsigned long size,
>  void mmu_early_enable(unsigned long membase, unsigned long memsize,
>  		      unsigned long _ttb)
>  {
> +	const struct pbl_reserved_memory *res_mem;
> +	int i;
>  	ttb = (uint32_t *)_ttb;
> +	res_mem =  get_pbl_reserved_memory();

Nitpick: could've been a single line.

>  
>  	arm_set_cache_functions();
>  
> @@ -58,6 +63,14 @@ void mmu_early_enable(unsigned long membase, unsigned long memsize,
>  	/* maps main memory as cachable */
>  	map_region(membase, memsize, PMD_SECT_DEF_CACHED);
>  
> +	for (i = 0; i < get_pbl_reserved_memory_num(); i++) {
> +		if (res_mem->flags & FDT_RES_MEM_FLAG_NOMAP)
> +			map_region(res_mem->base, res_mem->size,
> +				   PMD_SECT_DEF_UNCACHED | PMD_SECT_XN);
> +		res_mem++;
> +	}
> +
> +

Looks good:

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

>  	/*
>  	 * With HAB enabled we call into the ROM code later in imx6_hab_get_status().
>  	 * Map the ROM cached which has the effect that the XN bit is not set.

Would be nice to make this HAB exception just an entry in the reserved map,
but that's out of scope for this patch.

Cheers,
Ahmad


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  reply	other threads:[~2021-08-05 14:25 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-03  9:44 [PATCH v2 0/8] XN Support for reserved-memory areas Rouven Czerwinski
2021-08-03  9:44 ` [PATCH v2 1/8] of: reserve: add xn flag mem entries Rouven Czerwinski
2021-08-05 13:54   ` Ahmad Fatoum
2021-08-09 18:26   ` Sascha Hauer
2021-08-03  9:44 ` [PATCH v2 2/8] of: add of_get_reserve_map stub for !CONFIG_OFTREE Rouven Czerwinski
2021-08-05 13:55   ` Ahmad Fatoum
2021-08-03  9:44 ` [PATCH v2 3/8] ARM: mmu: use reserve mem entries to modify maps Rouven Czerwinski
2021-08-05 14:06   ` Ahmad Fatoum
2021-08-09 18:30     ` Sascha Hauer
2021-08-24  7:09       ` Ahmad Fatoum
2021-08-03  9:44 ` [PATCH v2 4/8] of: add flag to not create resmem DT entries Rouven Czerwinski
2021-08-05 14:09   ` Ahmad Fatoum
2021-08-03  9:44 ` [PATCH v2 5/8] of: add reserved_mem_read initcall Rouven Czerwinski
2021-08-05 14:14   ` Ahmad Fatoum
2021-08-03  9:44 ` [PATCH v2 6/8] pbl: fdt: add support to parse reserved mem Rouven Czerwinski
2021-08-05 14:20   ` Ahmad Fatoum
2021-08-03  9:44 ` [PATCH v2 7/8] ARM: mmu-early: map no-map entries XN & uncached Rouven Czerwinski
2021-08-05 14:24   ` Ahmad Fatoum [this message]
2021-08-03  9:44 ` [PATCH v2 8/8] PBL: enable LIBFDT for OP-TEE early loading Rouven Czerwinski
2021-08-05 13:53   ` Ahmad Fatoum
2021-08-24  6:47     ` Rouven Czerwinski

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