[PATCH master v3 5/5] ARM64: place PBL malloc area at start of barebox proper malloc area

[Alexander Shiyan]

Tested-by: Alexander Shiyan <eagle.alexander923 at gmail.com>

чт, 28 мая 2026 г. в 14:04, Ahmad Fatoum <a.fatoum at pengutronix.de>:
>
> The early PBL malloc area used by the Rockchip code overlaps the region
> used for OP-TEE. Moving it a bit lower would overlap the region occupied
> by the scratch area.
>
> With the switch to CONFIG_BAREBOX_MEMORY_OFFSET, we can compute the start
> of the malloc area in barebox proper without knowing how big barebox will
> eventually be, so make use of that and always place the PBL malloc area
> exactly at the start of the eventual barebox proper memory area.
>
> The memory will automatically be reclaimed when the TLSF allocator is
> instantiated and we will be sure not to overwrite anything by allocating
> in PBL.
>
> Reported-by: Alexander Shiyan <eagle.alexander923 at gmail.com>
> Fixes: 76b1f31275fe ("ARM: rockchip: initialize PBL malloc")
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  arch/arm/cpu/common.c              |  5 +++++
>  arch/arm/cpu/uncompress.c          |  4 ++++
>  arch/arm/include/asm/barebox-arm.h | 10 ++++++----
>  arch/arm/mach-rockchip/atf.c       |  2 +-
>  4 files changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/cpu/common.c b/arch/arm/cpu/common.c
> index 6b82ee8b810c..adb5d6a02bc8 100644
> --- a/arch/arm/cpu/common.c
> +++ b/arch/arm/cpu/common.c
> @@ -114,8 +114,13 @@ void print_pbl_mem_layout(ulong membase, ulong endmem, ulong barebox_base)
>  #endif
>         printf("arm_mem_barebox_image = 0x%08lx+0x%08lx\n",
>                barebox_base, arm_mem_barebox_image_end(endmem) - barebox_base);
> +#ifdef CONFIG_ARM64
> +       printf("pbl_malloc area       = 0x%08lx+0x%08x\n",
> +              barebox_malloc_base(membase, endmem - membase), PBL_MALLOC_SIZE);
> +#else
>         printf("arm_mem_early_malloc  = 0x%08lx+0x%08x\n",
>                barebox_base - PBL_MALLOC_SIZE, PBL_MALLOC_SIZE);
> +#endif
>         printf("membase               = 0x%08lx+0x%08lx\n",
>                membase, endmem - membase);
>  }
> diff --git a/arch/arm/cpu/uncompress.c b/arch/arm/cpu/uncompress.c
> index 61bcba6e8549..55bbe0019cc4 100644
> --- a/arch/arm/cpu/uncompress.c
> +++ b/arch/arm/cpu/uncompress.c
> @@ -75,7 +75,11 @@ void __noreturn barebox_pbl_start(unsigned long membase, unsigned long memsize,
>
>         handoff_data = (void *)barebox_base + ALIGN(uncompressed_len, 8) + MAX_BSS_SIZE;
>
> +#ifdef CONFIG_ARM64
> +       pbl_malloc_init(barebox_malloc_base(membase, memsize), PBL_MALLOC_SIZE);
> +#else
>         pbl_malloc_init(barebox_base - PBL_MALLOC_SIZE, PBL_MALLOC_SIZE);
> +#endif
>
>  #ifdef DEBUG
>         print_pbl_mem_layout(membase, endmem, barebox_base);
> diff --git a/arch/arm/include/asm/barebox-arm.h b/arch/arm/include/asm/barebox-arm.h
> index 38cceba010ed..f75cddc77243 100644
> --- a/arch/arm/include/asm/barebox-arm.h
> +++ b/arch/arm/include/asm/barebox-arm.h
> @@ -95,10 +95,12 @@ void *barebox_arm_boot_dtb(void);
>   *                       + BSS) rounded to SZ_1M
>   *                                   ↓
>   *  ---------------------- arm_mem_barebox_image() ---------------------
> - *                                   ↑
> - *                                SZ_128K
> - *                                   ↓
> - *  ------------------------ arm_mem_early_malloc ----------------------
> + *     ARM32      ↑                  |                ↕         ARM64
> + *         PBL_MALLOC_SIZE           |------- pbl_malloc area end ------
> + *                ↓                  |                ↑
> + *  --- arm_mem_early_malloc --------|         PBL_MALLOC_SIZE
> + *                                   |                ↓
> + *                                   ----- pbl_malloc area start -------
>   */
>  void print_pbl_mem_layout(ulong membase, ulong endmem, ulong barebox_base);
>
> diff --git a/arch/arm/mach-rockchip/atf.c b/arch/arm/mach-rockchip/atf.c
> index 14797a1e0601..74b8cdc2f499 100644
> --- a/arch/arm/mach-rockchip/atf.c
> +++ b/arch/arm/mach-rockchip/atf.c
> @@ -173,7 +173,7 @@ static void rockchip_atf_load_bl31(void *fdt)
>         unsigned long bl31_ep;
>
>         mmu_early_enable(membase[0], memsize[0]);
> -       pbl_malloc_init(membase[0] + memsize[0] - PBL_MALLOC_SIZE, PBL_MALLOC_SIZE);
> +       pbl_malloc_init(barebox_malloc_base(membase[0], memsize[0]), PBL_MALLOC_SIZE);
>
>         bl31_ep = load_elf64_image_phdr(&bl31);
>
> --
> 2.47.3
>