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fs.mitm: add and use memlet module to temporarily steal applet memory while building romfs images.

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Starting in 20.0.0, the browser needs more applet memory to function, so we can't steal as much any more.
Thus, we now steal 14 MB on 20.0.0+ instead of 40MB.

However, since this reduces memory available for custom system modules, we are adjusting to compensate.
ams.mitm's heap size has been reduced from 32MB to 12MB (recovering 20MB).
In addition, fs.mitm now uses a new mechanism for stealing memory from the applet pool while romfs is being built.

On net, we are compromising:
    * Custom sysmodules lose memory available to them.
        On 19.0.0/AMS 1.8.0, there was 30 MB available for custom sysmodules.
        Stealing 14 MB instead of 40 MB, we lose 26 MB of that. Reducing ams.mitm's usage will gain us back 20.
        Nintendo also appears to...use 4 extra MB, in 20.0.0, from my test homebrew.
        So on 20.0.0/AMS 1.9.0, there should be 20 MB available for custom sysmodules.
        On the bright side, on <20.0.0/AMS 1.9.0, I guess there will be 50 MB available for custom sysmodules now?
    * totk mods will lose the ability to...put every file in the romfs on sd card. There will be some unknown maximum filecount for totk mods.
        On the bright side, implementing the transient memory stealing should improve compatibility for some mods which strictly add files?
This commit is contained in:
Michael Scire
2025-05-02 20:17:16 -07:00
parent d0cb9b0eb7
commit 0ecc35c062
19 changed files with 672 additions and 12 deletions
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3
atmosphere.mk
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@@ -50,6 +50,7 @@ dist: dist-no-debug
cp $(CURRENT_DIRECTORY)/stratosphere/sm/$(ATMOSPHERE_OUT_DIR)/sm.elf $(DIST_DIR)/sm.elf
cp $(CURRENT_DIRECTORY)/stratosphere/spl/$(ATMOSPHERE_OUT_DIR)/spl.elf $(DIST_DIR)/spl.elf
cp $(CURRENT_DIRECTORY)/stratosphere/TioServer/$(ATMOSPHERE_OUT_DIR)/TioServer.elf $(DIST_DIR)/TioServer.elf
cp $(CURRENT_DIRECTORY)/stratosphere/memlet/$(ATMOSPHERE_OUT_DIR)/memlet.elf $(DIST_DIR)/memlet.elf
cp $(CURRENT_DIRECTORY)/troposphere/daybreak/daybreak.elf $(DIST_DIR)/daybreak.elf
cp $(CURRENT_DIRECTORY)/troposphere/haze/haze.elf $(DIST_DIR)/haze.elf
cp $(CURRENT_DIRECTORY)/troposphere/reboot_to_payload/reboot_to_payload.elf $(DIST_DIR)/reboot_to_payload.elf
@@ -87,6 +88,7 @@ dist-no-debug: package3 $(CURRENT_DIRECTORY)/$(ATMOSPHERE_OUT_DIR)
#mkdir -p $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/010000000000003c
mkdir -p $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/0100000000000042
mkdir -p $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/0100000000000420
mkdir -p $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/0100000000000421
mkdir -p $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/010000000000b240
mkdir -p $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/010000000000d609
mkdir -p $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/010000000000d623
@@ -104,6 +106,7 @@ dist-no-debug: package3 $(CURRENT_DIRECTORY)/$(ATMOSPHERE_OUT_DIR)
cp stratosphere/htc/$(ATMOSPHERE_OUT_DIR)/htc.nsp $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/010000000000b240/exefs.nsp
cp stratosphere/dmnt.gen2/$(ATMOSPHERE_OUT_DIR)/dmnt.gen2.nsp $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/010000000000d609/exefs.nsp
cp stratosphere/TioServer/$(ATMOSPHERE_OUT_DIR)/TioServer.nsp $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/010000000000d623/exefs.nsp
cp stratosphere/memlet/$(ATMOSPHERE_OUT_DIR)/memlet.nsp $(DIST_DIR)/stratosphere_romfs/atmosphere/contents/0100000000000421/exefs.nsp
@build_romfs $(DIST_DIR)/stratosphere_romfs $(DIST_DIR)/atmosphere/stratosphere.romfs
rm -r $(DIST_DIR)/stratosphere_romfs
cp troposphere/reboot_to_payload/reboot_to_payload.nro $(DIST_DIR)/switch/reboot_to_payload.nro