From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "Stephen Boyd" <sboyd@kernel.org>,
"Kumar Gala" <kumar.gala@linaro.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Geert Uytterhoeven" <geert+renesas@glider.be>,
"Nicolas Pitre" <nico@fluxnic.net>,
"Masahiro Yamada" <masahiroy@kernel.org>,
"Lukasz Stelmach" <l.stelmach@samsung.com>,
"Bjorn Andersson" <bjorn.andersson@linaro.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
"Chris Brandt" <chris.brandt@renesas.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Eric Miao" <eric.miao@nvidia.com>,
"Dmitry Osipenko" <digetx@gmail.com>,
"Laura Abbott" <labbott@redhat.com>,
"Ard Biesheuvel" <ardb@kernel.org>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>
Subject: Re: [PATCH/RFC v7] ARM: boot: Obtain start of physical memory from DTB
Date: Sat, 15 Aug 2020 10:16:21 +0100 [thread overview]
Message-ID: <20200815091620.GV1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <CACRpkdaN22OjWsG+d-hp_NEw==3VVAsWHkFsiG642KmbjD_6Mg@mail.gmail.com>
On Fri, Aug 14, 2020 at 04:03:41PM +0200, Linus Walleij wrote:
> But TEXT_OFFSET is also used inside the kernel to offset the
> virtual memory. This means that when we set up the virtual
> memory split, the kernel virtual memory is also bumped by
> these 2 MB so the virtual memory starts at 0xC0208000
> instead of 0xC0008000 as is normal.
No. Virtual memory starts without the 32KiB offset. The L1 swapper
page table starts 16KiB below (or slightly more if LPAE) for example.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
WARNING: multiple messages have this Message-ID (diff)
From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "Kumar Gala" <kumar.gala@linaro.org>,
"Arnd Bergmann" <arnd@arndb.de>,
"Geert Uytterhoeven" <geert+renesas@glider.be>,
"Nicolas Pitre" <nico@fluxnic.net>,
"Stephen Boyd" <sboyd@kernel.org>,
"Masahiro Yamada" <masahiroy@kernel.org>,
"Lukasz Stelmach" <l.stelmach@samsung.com>,
"Bjorn Andersson" <bjorn.andersson@linaro.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
"Chris Brandt" <chris.brandt@renesas.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"Eric Miao" <eric.miao@nvidia.com>,
"Dmitry Osipenko" <digetx@gmail.com>,
"Laura Abbott" <labbott@redhat.com>,
"Ard Biesheuvel" <ardb@kernel.org>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"Marek Szyprowski" <m.szyprowski@samsung.com>
Subject: Re: [PATCH/RFC v7] ARM: boot: Obtain start of physical memory from DTB
Date: Sat, 15 Aug 2020 10:16:21 +0100 [thread overview]
Message-ID: <20200815091620.GV1551@shell.armlinux.org.uk> (raw)
In-Reply-To: <CACRpkdaN22OjWsG+d-hp_NEw==3VVAsWHkFsiG642KmbjD_6Mg@mail.gmail.com>
On Fri, Aug 14, 2020 at 04:03:41PM +0200, Linus Walleij wrote:
> But TEXT_OFFSET is also used inside the kernel to offset the
> virtual memory. This means that when we set up the virtual
> memory split, the kernel virtual memory is also bumped by
> these 2 MB so the virtual memory starts at 0xC0208000
> instead of 0xC0008000 as is normal.
No. Virtual memory starts without the 32KiB offset. The L1 swapper
page table starts 16KiB below (or slightly more if LPAE) for example.
--
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-08-15 22:02 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 15:02 [PATCH/RFC v7] ARM: boot: Obtain start of physical memory from DTB Geert Uytterhoeven
2020-07-06 15:02 ` Geert Uytterhoeven
2020-07-07 6:50 ` Ard Biesheuvel
2020-07-07 6:50 ` Ard Biesheuvel
2020-07-07 7:39 ` Geert Uytterhoeven
2020-07-07 7:39 ` Geert Uytterhoeven
2020-07-07 7:45 ` Ard Biesheuvel
2020-07-07 7:45 ` Ard Biesheuvel
2020-07-07 7:58 ` Geert Uytterhoeven
2020-07-07 7:58 ` Geert Uytterhoeven
2020-07-07 8:35 ` Ard Biesheuvel
2020-07-07 8:35 ` Ard Biesheuvel
2020-07-07 8:40 ` Ard Biesheuvel
2020-07-07 8:40 ` Ard Biesheuvel
2020-07-07 9:09 ` Ard Biesheuvel
2020-07-07 9:09 ` Ard Biesheuvel
2020-07-20 9:45 ` Linus Walleij
2020-07-20 9:45 ` Linus Walleij
2020-07-20 9:53 ` Arnd Bergmann
2020-07-20 9:53 ` Arnd Bergmann
2020-07-21 12:58 ` Linus Walleij
2020-07-21 12:58 ` Linus Walleij
2020-07-23 1:19 ` Stephen Boyd
2020-07-23 1:19 ` Stephen Boyd
2020-08-03 10:18 ` Geert Uytterhoeven
2020-08-03 10:18 ` Geert Uytterhoeven
2020-08-03 19:46 ` Stephen Boyd
2020-08-03 19:46 ` Stephen Boyd
2020-08-14 14:03 ` Linus Walleij
2020-08-14 14:03 ` Linus Walleij
2020-08-14 14:06 ` Ard Biesheuvel
2020-08-14 14:06 ` Ard Biesheuvel
2020-08-15 9:18 ` Russell King - ARM Linux admin
2020-08-15 9:18 ` Russell King - ARM Linux admin
2020-08-15 8:28 ` Stephen Boyd
2020-08-15 8:28 ` Stephen Boyd
2020-08-15 9:16 ` Russell King - ARM Linux admin [this message]
2020-08-15 9:16 ` Russell King - ARM Linux admin
2020-08-15 10:28 ` Linus Walleij
2020-08-15 10:28 ` Linus Walleij
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